diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
new file mode 100644
index 00000000..73eda828
--- /dev/null
+++ b/.github/workflows/continuous-integration.yml
@@ -0,0 +1,200 @@
+name: Continuous Integration
+
+on:
+  schedule:
+    - cron: "0 * * * *"
+  workflow_dispatch:
+    inputs:
+      logLevel:
+        description: "Log level"
+        required: true
+        default: "info"
+        type: choice
+        options:
+          - info
+          - warning
+          - debug
+
+env:
+  TZ: Asia/Jakarta
+  EMOJI_CHEAT_SHEETS: "👻,😻,💕,🤍,💨,🧚,🧜‍♀️,🧞,💃,🐣,🐉,🦕,🦖,🐳,🐬,🦋,🌻,🌼,🌱,🌿,🍀,🍃,🍻,🛫,🪂,🚀,🌟,✨,⚡,🔥,🎉"
+
+jobs:
+  build:
+    name: Build and Testing
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: "go.mod"
+
+      - name: Build
+        run: go build -v ./...
+
+      - name: Test
+        run: go test -v ./...
+
+  prepare:
+    name: Prepare Branch
+    runs-on: ubuntu-latest
+    needs: [build]
+
+    steps:
+      - name: Checkout main branch
+        uses: actions/checkout@v4
+        with:
+          ref: main
+
+      - name: Remove ${{ vars.ARCHIVE_BRANCH_NAME }} branch if it exists
+        run: |
+          if git ls-remote --exit-code --heads origin ${{ vars.ARCHIVE_BRANCH_NAME }}; then
+            echo "Branch deleted successfully"
+            git push https://x-access-token:${{ secrets.WORKFLOW_GITHUB_TOKEN }}@github.com/${{ github.repository }} --delete ${{ vars.ARCHIVE_BRANCH_NAME }}
+          else
+            echo "Branch does not exist"
+          fi
+
+  update:
+    name: Update Proxies
+    runs-on: ubuntu-latest
+    needs: [prepare]
+    permissions:
+      contents: write
+
+    steps:
+      - name: Checkout main branch
+        uses: actions/checkout@v4
+        with:
+          ref: main
+
+      - name: Configure GIT
+        run: |
+          git config --global user.email $(git log --reverse --format='%ae' | head -n 1)
+          git config --global user.name $(git log --reverse --format='%an' | head -n 1)
+
+      - name: Create ${{ vars.ARCHIVE_BRANCH_NAME }} branch
+        run: |
+          git checkout -b ${{ vars.ARCHIVE_BRANCH_NAME }}
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: "go.mod"
+
+      - name: Install dependencies
+        run: |
+          go mod tidy
+
+      - name: Run Go program
+        env:
+          PROXY_RESOURCES: ${{ secrets.PROXY_RESOURCES }}
+        run: |
+          go run ./cmd/main.go
+
+      - name: Check for changes
+        run: |
+          if [ "$(git status --porcelain)" ]; then
+            echo "Changes detected"
+            echo "CHANGES_EXIST=true" >> $GITHUB_ENV
+          else
+            echo "No changes to commit"
+            echo "CHANGES_EXIST=false" >> $GITHUB_ENV
+          fi
+
+      - name: Commit files
+        if: env.CHANGES_EXIST == 'true'
+        run: |
+          git add storage
+          git commit -m "chore(bot): update proxies at $(date '+%a, %d %b %Y %H:%M:%S (GMT+07:00)' | tr '[:upper:]' '[:lower:]') $(echo $EMOJI_CHEAT_SHEETS | tr ',' '\n' | shuf -n 1)"
+
+      - name: Push changes to ${{ vars.ARCHIVE_BRANCH_NAME }} branch
+        if: env.CHANGES_EXIST == 'true'
+        uses: ad-m/github-push-action@master
+        with:
+          github_token: ${{ secrets.WORKFLOW_GITHUB_TOKEN }}
+          branch: ${{ vars.ARCHIVE_BRANCH_NAME }}
+          force: true
+
+  release:
+    name: Release
+    runs-on: ubuntu-latest
+    needs: [update]
+    permissions:
+      contents: write
+
+    steps:
+      - name: Checkout ${{ vars.ARCHIVE_BRANCH_NAME }} branch
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ vars.ARCHIVE_BRANCH_NAME }}
+
+      - name: Configure GIT
+        run: |
+          git config --global user.email $(git log --reverse --format='%ae' | head -n 1)
+          git config --global user.name $(git log --reverse --format='%an' | head -n 1)
+
+      - name: Get last commit time on ${{ vars.ARCHIVE_BRANCH_NAME }} branch
+        run: |
+          echo "UPDATED_AT=$(date -d "$(git log -1 --format=%cd --date=iso-strict)" "+%A, %B %e, %Y at %H:%M:%S (GMT+07:00)" | awk '{$1=$1; print}')" >> $GITHUB_ENV
+
+      - name: Count proxies
+        run: |
+          echo "HTTP_PROXY_COUNT=$(grep -v '^$' ./storage/classic/http.txt | wc -l)" >> $GITHUB_ENV
+          echo "HTTPS_PROXY_COUNT=$(grep -v '^$' ./storage/classic/https.txt | wc -l)" >> $GITHUB_ENV
+          echo "SOCKS4_PROXY_COUNT=$(grep -v '^$' ./storage/classic/socks4.txt | wc -l)" >> $GITHUB_ENV
+          echo "SOCKS5_PROXY_COUNT=$(grep -v '^$' ./storage/classic/socks5.txt | wc -l)" >> $GITHUB_ENV
+
+      - name: Extract 10 fresh proxies
+        run: |
+          echo "HTTP_PROXIES=$(shuf -n 10 ./storage/classic/http.txt | awk '{printf "%s\\n", $0}')" >> $GITHUB_ENV
+          echo "HTTPS_PROXIES=$(shuf -n 10 ./storage/classic/https.txt | awk '{printf "%s\\n", $0}')" >> $GITHUB_ENV
+          echo "SOCKS4_PROXIES=$(shuf -n 10 ./storage/classic/socks4.txt | awk '{printf "%s\\n", $0}')" >> $GITHUB_ENV
+          echo "SOCKS5_PROXIES=$(shuf -n 10 ./storage/classic/socks5.txt | awk '{printf "%s\\n", $0}')" >> $GITHUB_ENV
+
+      - name: Checkout main branch
+        uses: actions/checkout@v4
+        with:
+          ref: main
+
+      - name: Update documentation
+        run: |
+          sed \
+            -e "s/{{UPDATED_AT}}/${UPDATED_AT}/" \
+            -e "s/{{HTTP_PROXY_COUNT}}/${HTTP_PROXY_COUNT}/" \
+            -e "s/{{HTTPS_PROXY_COUNT}}/${HTTPS_PROXY_COUNT}/" \
+            -e "s/{{SOCKS4_PROXY_COUNT}}/${SOCKS4_PROXY_COUNT}/" \
+            -e "s/{{SOCKS5_PROXY_COUNT}}/${SOCKS5_PROXY_COUNT}/" \
+            -e "s/{{HTTP_PROXIES}}/${HTTP_PROXIES}/" \
+            -e "s/{{HTTPS_PROXIES}}/${HTTPS_PROXIES}/" \
+            -e "s/{{SOCKS4_PROXIES}}/${SOCKS4_PROXIES}/" \
+            -e "s/{{SOCKS5_PROXIES}}/${SOCKS5_PROXIES}/" \
+          ./docs/README.template.md > ./README.md
+
+      - name: Check for changes
+        run: |
+          if [ "$(git status --porcelain)" ]; then
+            echo "Changes detected"
+            echo "CHANGES_EXIST=true" >> $GITHUB_ENV
+          else
+            echo "No changes to commit"
+            echo "CHANGES_EXIST=false" >> $GITHUB_ENV
+          fi
+
+      - name: Commit changes
+        if: env.CHANGES_EXIST == 'true'
+        run: |
+          git add README.md
+          git commit -m "docs: release fresh proxy list $(echo $EMOJI_CHEAT_SHEETS | tr ',' '\n' | shuf -n 1)"
+
+      - name: Push changes
+        if: env.CHANGES_EXIST == 'true'
+        uses: ad-m/github-push-action@master
+        with:
+          github_token: ${{ secrets.WORKFLOW_GITHUB_TOKEN }}
+          branch: main
+          force: true
diff --git a/.github/workflows/static-analysis.yml b/.github/workflows/static-analysis.yml
new file mode 100644
index 00000000..d2b51ecd
--- /dev/null
+++ b/.github/workflows/static-analysis.yml
@@ -0,0 +1,25 @@
+name: Static Analysis
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    name: Build and Testing
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: "go.mod"
+
+      - name: Build
+        run: go build -v ./...
+
+      - name: Test
+        run: go test -v ./...
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000..27512370
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+/.idea
+/.vscode
+.env
+*temp.*
\ No newline at end of file
diff --git a/LICENSE.md b/LICENSE.md
new file mode 100644
index 00000000..fcb20898
--- /dev/null
+++ b/LICENSE.md
@@ -0,0 +1,19 @@
+The MIT License (MIT)
+
+Copyright (c) Azis Alvriyanto <azisalvriyanto@membasuh.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+and associated documentation files (the "Software"), to deal in the Software without restriction,
+including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons
+to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 00000000..61a859a0
--- /dev/null
+++ b/README.md
@@ -0,0 +1,142 @@
+[donate::shield]: https://img.shields.io/badge/Donate-Saweria-orange.svg
+[donate::url]: https://saweria.co/azisalvriyanto
+[contributors::shield]: https://img.shields.io/github/contributors/fyvri/fresh-proxy-list?style=flat
+[contributors::url]: https://github.com/fyvri/fresh-proxy-list/graphs/contributors
+[license::shield]: https://img.shields.io/badge/License-MIT-4b9081?style=flat
+[license::url]: https://github.com/fyvri/fresh-proxy-list/blob/HEAD/LICENSE.md
+[watchers::shield]: https://img.shields.io/github/watchers/fyvri/fresh-proxy-list?style=flat&logo=github&label=Watchers
+[watchers::url]: https://github.com/fyvri/fresh-proxy-list/watchers
+[stars::shield]: https://img.shields.io/github/stars/fyvri/fresh-proxy-list?style=flat&logo=github&label=Stars
+[stars::url]: https://github.com/fyvri/fresh-proxy-list/stargazers
+[forks::shield]: https://img.shields.io/github/forks/fyvri/fresh-proxy-list?style=flat&logo=github&label=Forks
+[forks::url]: https://github.com/fyvri/fresh-proxy-list/network/members
+[continuous-integration::shield]: https://github.com/fyvri/fresh-proxy-list/actions/workflows/continuous-integration.yml/badge.svg
+[continuous-integration::url]: https://github.com/fyvri/fresh-proxy-list/actions/workflows/continuous-integration.yml
+[static-analysis::shield]: https://github.com/fyvri/fresh-proxy-list/actions/workflows/static-analysis.yml/badge.svg
+[static-analysis::url]: https://github.com/fyvri/fresh-proxy-list/actions/workflows/static-analysis.yml
+[last-commit::shield]: https://img.shields.io/github/last-commit/fyvri/fresh-proxy-list?style=flat&logo=github&label=last+update
+[last-commit::url]: https://github.com/fyvri/fresh-proxy-list/activity?ref=archive
+[commit-activity::shield]: https://img.shields.io/github/commit-activity/w/fyvri/fresh-proxy-list?style=flat&logo=github
+[commit-activity::url]: https://github.com/fyvri/fresh-proxy-list/commits/archive
+[discussions::shield]: https://img.shields.io/github/discussions/fyvri/fresh-proxy-list?style=flat&logo=github
+[discussions::url]: https://github.com/fyvri/fresh-proxy-list/discussions
+[issues::shield]: https://img.shields.io/github/issues/fyvri/fresh-proxy-list?style=flat&logo=github
+[issues::url]: https://github.com/fyvri/fresh-proxy-list/issues
+
+<div id="readme-top" align="center">
+
+<h1> Fresh Proxy List</h1>
+
+[![Donate][donate::shield]][donate::url]
+[![License][license::shield]][license::url]
+[![Static Analysis][static-analysis::shield]][static-analysis::url]
+[![Continuous Integration][continuous-integration::shield]][continuous-integration::url]
+</br>
+[![Last Commit][last-commit::shield]][last-commit::url]
+[![Commit Activity][commit-activity::shield]][commit-activity::url]
+[![Discussions][discussions::shield]][discussions::url]
+[![Issues][issues::shield]][issues::url]
+
+An automatically ⏰ updated list of free `HTTP`, `HTTPS`, `SOCKS4`, and `SOCKS5` proxies, available in multiple formats including `TXT`, `CSV`, `JSON`, `XML`, and `YAML`. The list is refreshed ⚡ **hourly** to provide the most accurate 🎯 and up-to-date information. The current data snapshot was 🚀 last updated on `Friday, December 6, 2024`, ensuring that users have access to the latest and most reliable proxies 🍃 available.
+
+<picture>
+  <img alt="HTTP" src="https://img.shields.io/badge/HTTP-0-4b9081?style=social&logo=adminer" />
+</picture>
+&nbsp;
+<picture>
+  <img alt="HTTPS" src="https://img.shields.io/badge/HTTPS-0-4b9081?style=social&logo=adminer" />
+</picture>
+&nbsp;
+<picture>
+  <img alt="SOCKS4" src="https://img.shields.io/badge/SOCKS4-0-4b9081?style=social&logo=adminer" />
+</picture>
+&nbsp;
+<picture>
+  <img alt="SOCKS5" src="https://img.shields.io/badge/SOCKS5-0-4b9081?style=social&logo=adminer" />
+</picture>
+
+</div>
+
+## 📃 About
+
+This repository contains a free list of `HTTP/S` and `SOCKS4/5` proxies.
+
+- [x] 24/7 hourly updates (Committing since December 2024)
+- [x] Supported list formats: `TXT`, `CSV`, `JSON`, `XML`, and `YAML`
+- [x] No authentication is required when connecting any of these proxies
+
+> [!TIP]
+> Be sure to read this documentation.
+
+<p align="right">[ <a href="#readme-top">back to top</a> ]</p>
+
+## 🔗 Proxy List Links
+
+Duplicated proxies are removed — the only exception is if an IP has a different port open.
+
+1.  Classic View (IP:Port only)
+
+    | Category | Links by File Type                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
+    | -------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+    | All      | [`TXT`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/all.txt), [`CSV`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/all.csv), [`JSON`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/all.json), [`XML`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/all.xml), [`YAML`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/all.yaml)                |
+    | HTTP     | [`TXT`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/http.txt), [`CSV`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/http.csv), [`JSON`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/http.json), [`XML`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/http.xml), [`YAML`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/http.yaml)           |
+    | HTTPS    | [`TXT`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/https.txt), [`CSV`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/https.csv), [`JSON`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/https.json), [`XML`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/https.xml), [`YAML`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/https.yaml)      |
+    | SOCKS4   | [`TXT`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/socks4.txt), [`CSV`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/socks4.csv), [`JSON`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/socks4.json), [`XML`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/socks4.xml), [`YAML`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/socks4.yaml) |
+    | SOCKS5   | [`TXT`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/socks5.txt), [`CSV`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/socks5.csv), [`JSON`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/socks5.json), [`XML`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/socks5.xml), [`YAML`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/socks5.yaml) |
+
+2.  Advanced View (With full information)
+
+    _Coming soon_
+
+<p align="right">[ <a href="#readme-top">back to top</a> ]</p>
+
+## 🎁 Example Results
+
+HTTP
+
+```txt
+
+```
+
+HTTPS
+
+```txt
+
+```
+
+SOCKS4
+
+```txt
+
+```
+
+SOCKS5
+
+```txt
+
+```
+
+<p align="right">[ <a href="#readme-top">back to top</a> ]</p>
+
+## 👥 Contributing
+
+If you have any ideas, [open an issue](https://github.com/fyvri/fresh-proxy-list/issues/new) and tell me what you think.
+
+Contributions are what make the open-source community such an amazing place to learn, inspire, and create. Any contributions you make are **greatly appreciated**.
+
+> [!IMPORTANT]
+> If you have a suggestion that would make this better, please fork the repo and create a pull request. Don't forget to give the project a star 🌟! I can't stop saying thank you!
+>
+> 1. Fork this project
+> 2. Create your feature branch (`git checkout -b feature/awesome-feature`)
+> 3. Commit your changes (`git commit -m "feat: add awesome feature"`)
+> 4. Push to the branch (`git push origin feature/awesome-feature`)
+> 5. Open a pull request
+
+<p align="right">[ <a href="#readme-top">back to top</a> ]</p>
+
+## 📜 License
+
+The MIT License (MIT). Please see [License File](LICENSE.md) for more information.
+
+<p align="right">[ <a href="#readme-top">back to top</a> ]</p>
diff --git a/cmd/main.go b/cmd/main.go
new file mode 100644
index 00000000..99a759dd
--- /dev/null
+++ b/cmd/main.go
@@ -0,0 +1,127 @@
+package main
+
+import (
+	"io"
+	"log"
+	"net/http"
+	"os"
+	"slices"
+	"sync"
+	"time"
+
+	"github.com/fyvri/fresh-proxy-list/internal/entity"
+	"github.com/fyvri/fresh-proxy-list/internal/infrastructure/config"
+	"github.com/fyvri/fresh-proxy-list/internal/infrastructure/repository"
+	"github.com/fyvri/fresh-proxy-list/internal/service"
+	"github.com/fyvri/fresh-proxy-list/internal/usecase"
+	"github.com/fyvri/fresh-proxy-list/pkg/utils"
+
+	"github.com/joho/godotenv"
+)
+
+type Runners struct {
+	fetcherUtil      utils.FetcherUtilInterface
+	urlParserUtil    utils.URLParserUtilInterface
+	proxyService     service.ProxyServiceInterface
+	sourceRepository repository.SourceRepositoryInterface
+	proxyRepository  repository.ProxyRepositoryInterface
+	fileRepository   repository.FileRepositoryInterface
+}
+
+func main() {
+	if err := runApplication(); err != nil {
+		log.Fatalf("Application error: %v", err)
+	}
+}
+
+func runApplication() error {
+	loadEnv()
+
+	httpTestingSites := config.HTTPTestingSites
+	httpsTestingSites := config.HTTPSTestingSites
+	userAgents := config.UserAgents
+
+	mkdirAll := func(path string, perm os.FileMode) error {
+		return os.MkdirAll(path, perm)
+	}
+	create := func(name string) (io.Writer, error) {
+		file, err := os.Create(name)
+		if err != nil {
+			return nil, err
+		}
+		return file, nil
+	}
+
+	fetcherUtil := utils.NewFetcher(http.DefaultClient, http.NewRequest)
+	urlParserUtil := utils.NewURLParser()
+	csvWriterUtil := utils.NewCSVWriter()
+	proxyService := service.NewProxyService(fetcherUtil, urlParserUtil, httpTestingSites, httpsTestingSites, userAgents)
+	sourceRepository := repository.NewSourceRepository(os.Getenv("PROXY_RESOURCES"))
+	proxyRepository := repository.NewProxyRepository()
+	fileRepository := repository.NewFileRepository(mkdirAll, create, csvWriterUtil)
+
+	runners := Runners{
+		fetcherUtil:      fetcherUtil,
+		urlParserUtil:    urlParserUtil,
+		proxyService:     proxyService,
+		sourceRepository: sourceRepository,
+		proxyRepository:  proxyRepository,
+		fileRepository:   fileRepository,
+	}
+
+	return run(runners)
+}
+
+func loadEnv() error {
+	return godotenv.Load()
+}
+
+func run(runners Runners) error {
+	startTime := time.Now()
+
+	sourceUsecase := usecase.NewSourceUsecase(runners.sourceRepository, runners.fetcherUtil)
+	sources, err := sourceUsecase.LoadSources()
+	if err != nil {
+		return err
+	}
+
+	wg := sync.WaitGroup{}
+	proxyCategories := config.ProxyCategories
+	specialIPs := config.SpecialIPs
+	privateIPs := config.PrivateIPs
+	proxyUsecase := usecase.NewProxyUsecase(runners.proxyRepository, runners.proxyService, specialIPs, privateIPs)
+	for i, source := range sources {
+		if _, found := slices.BinarySearch(proxyCategories, source.Category); found {
+			wg.Add(1)
+			go func(source entity.Source) {
+				defer wg.Done()
+
+				innerWG := sync.WaitGroup{}
+				proxies, err := sourceUsecase.ProcessSource(&source)
+				if err != nil {
+					return
+				}
+
+				for _, proxy := range proxies {
+					innerWG.Add(1)
+					go func(source entity.Source, proxy string) {
+						defer innerWG.Done()
+						proxyUsecase.ProcessProxy(source.Category, proxy, source.IsChecked)
+					}(source, proxy)
+				}
+				innerWG.Wait()
+			}(source)
+		} else {
+			log.Printf("Index %v: proxy category not found", i)
+		}
+	}
+	wg.Wait()
+
+	fileOutputExtensions := config.FileOutputExtensions
+	fileUsecase := usecase.NewFileUsecase(runners.fileRepository, runners.proxyRepository, fileOutputExtensions)
+	fileUsecase.SaveFiles()
+
+	log.Printf("Number of proxies     : %v", len(proxyUsecase.GetAllAdvancedView()))
+	log.Printf("Time-consuming process: %v", time.Since(startTime))
+	return nil
+}
diff --git a/docs/README.template.md b/docs/README.template.md
new file mode 100644
index 00000000..7b937dd0
--- /dev/null
+++ b/docs/README.template.md
@@ -0,0 +1,142 @@
+[donate::shield]: https://img.shields.io/badge/Donate-Saweria-orange.svg
+[donate::url]: https://saweria.co/azisalvriyanto
+[contributors::shield]: https://img.shields.io/github/contributors/fyvri/fresh-proxy-list?style=flat
+[contributors::url]: https://github.com/fyvri/fresh-proxy-list/graphs/contributors
+[license::shield]: https://img.shields.io/badge/License-MIT-4b9081?style=flat
+[license::url]: https://github.com/fyvri/fresh-proxy-list/blob/HEAD/LICENSE.md
+[watchers::shield]: https://img.shields.io/github/watchers/fyvri/fresh-proxy-list?style=flat&logo=github&label=Watchers
+[watchers::url]: https://github.com/fyvri/fresh-proxy-list/watchers
+[stars::shield]: https://img.shields.io/github/stars/fyvri/fresh-proxy-list?style=flat&logo=github&label=Stars
+[stars::url]: https://github.com/fyvri/fresh-proxy-list/stargazers
+[forks::shield]: https://img.shields.io/github/forks/fyvri/fresh-proxy-list?style=flat&logo=github&label=Forks
+[forks::url]: https://github.com/fyvri/fresh-proxy-list/network/members
+[continuous-integration::shield]: https://github.com/fyvri/fresh-proxy-list/actions/workflows/continuous-integration.yml/badge.svg
+[continuous-integration::url]: https://github.com/fyvri/fresh-proxy-list/actions/workflows/continuous-integration.yml
+[static-analysis::shield]: https://github.com/fyvri/fresh-proxy-list/actions/workflows/static-analysis.yml/badge.svg
+[static-analysis::url]: https://github.com/fyvri/fresh-proxy-list/actions/workflows/static-analysis.yml
+[last-commit::shield]: https://img.shields.io/github/last-commit/fyvri/fresh-proxy-list?style=flat&logo=github&label=last+update
+[last-commit::url]: https://github.com/fyvri/fresh-proxy-list/activity?ref=archive
+[commit-activity::shield]: https://img.shields.io/github/commit-activity/w/fyvri/fresh-proxy-list?style=flat&logo=github
+[commit-activity::url]: https://github.com/fyvri/fresh-proxy-list/commits/archive
+[discussions::shield]: https://img.shields.io/github/discussions/fyvri/fresh-proxy-list?style=flat&logo=github
+[discussions::url]: https://github.com/fyvri/fresh-proxy-list/discussions
+[issues::shield]: https://img.shields.io/github/issues/fyvri/fresh-proxy-list?style=flat&logo=github
+[issues::url]: https://github.com/fyvri/fresh-proxy-list/issues
+
+<div id="readme-top" align="center">
+
+<h1> Fresh Proxy List</h1>
+
+[![Donate][donate::shield]][donate::url]
+[![License][license::shield]][license::url]
+[![Static Analysis][static-analysis::shield]][static-analysis::url]
+[![Continuous Integration][continuous-integration::shield]][continuous-integration::url]
+</br>
+[![Last Commit][last-commit::shield]][last-commit::url]
+[![Commit Activity][commit-activity::shield]][commit-activity::url]
+[![Discussions][discussions::shield]][discussions::url]
+[![Issues][issues::shield]][issues::url]
+
+An automatically ⏰ updated list of free `HTTP`, `HTTPS`, `SOCKS4`, and `SOCKS5` proxies, available in multiple formats including `TXT`, `CSV`, `JSON`, `XML`, and `YAML`. The list is refreshed ⚡ **hourly** to provide the most accurate 🎯 and up-to-date information. The current data snapshot was 🚀 last updated on `{{UPDATED_AT}}`, ensuring that users have access to the latest and most reliable proxies 🍃 available.
+
+<picture>
+  <img alt="HTTP" src="https://img.shields.io/badge/HTTP-{{HTTP_PROXY_COUNT}}-4b9081?style=social&logo=adminer" />
+</picture>
+&nbsp;
+<picture>
+  <img alt="HTTPS" src="https://img.shields.io/badge/HTTPS-{{HTTPS_PROXY_COUNT}}-4b9081?style=social&logo=adminer" />
+</picture>
+&nbsp;
+<picture>
+  <img alt="SOCKS4" src="https://img.shields.io/badge/SOCKS4-{{SOCKS4_PROXY_COUNT}}-4b9081?style=social&logo=adminer" />
+</picture>
+&nbsp;
+<picture>
+  <img alt="SOCKS5" src="https://img.shields.io/badge/SOCKS5-{{SOCKS5_PROXY_COUNT}}-4b9081?style=social&logo=adminer" />
+</picture>
+
+</div>
+
+## 📃 About
+
+This repository contains a free list of `HTTP/S` and `SOCKS4/5` proxies.
+
+- [x] 24/7 hourly updates (Committing since December 2024)
+- [x] Supported list formats: `TXT`, `CSV`, `JSON`, `XML`, and `YAML`
+- [x] No authentication is required when connecting any of these proxies
+
+> [!TIP]
+> Be sure to read this documentation.
+
+<p align="right">[ <a href="#readme-top">back to top</a> ]</p>
+
+## 🔗 Proxy List Links
+
+Duplicated proxies are removed — the only exception is if an IP has a different port open.
+
+1.  Classic View (IP:Port only)
+
+    | Category | Links by File Type                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
+    | -------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+    | All      | [`TXT`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/all.txt), [`CSV`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/all.csv), [`JSON`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/all.json), [`XML`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/all.xml), [`YAML`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/all.yaml)                |
+    | HTTP     | [`TXT`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/http.txt), [`CSV`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/http.csv), [`JSON`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/http.json), [`XML`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/http.xml), [`YAML`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/http.yaml)           |
+    | HTTPS    | [`TXT`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/https.txt), [`CSV`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/https.csv), [`JSON`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/https.json), [`XML`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/https.xml), [`YAML`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/https.yaml)      |
+    | SOCKS4   | [`TXT`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/socks4.txt), [`CSV`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/socks4.csv), [`JSON`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/socks4.json), [`XML`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/socks4.xml), [`YAML`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/socks4.yaml) |
+    | SOCKS5   | [`TXT`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/socks5.txt), [`CSV`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/socks5.csv), [`JSON`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/socks5.json), [`XML`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/socks5.xml), [`YAML`](https://raw.githubusercontent.com/fyvri/fresh-proxy-list/archive/storage/classic/socks5.yaml) |
+
+2.  Advanced View (With full information)
+
+    _Coming soon_
+
+<p align="right">[ <a href="#readme-top">back to top</a> ]</p>
+
+## 🎁 Example Results
+
+HTTP
+
+```txt
+{{HTTP_PROXIES}}
+```
+
+HTTPS
+
+```txt
+{{HTTPS_PROXIES}}
+```
+
+SOCKS4
+
+```txt
+{{SOCKS4_PROXIES}}
+```
+
+SOCKS5
+
+```txt
+{{SOCKS5_PROXIES}}
+```
+
+<p align="right">[ <a href="#readme-top">back to top</a> ]</p>
+
+## 👥 Contributing
+
+If you have any ideas, [open an issue](https://github.com/fyvri/fresh-proxy-list/issues/new) and tell me what you think.
+
+Contributions are what make the open-source community such an amazing place to learn, inspire, and create. Any contributions you make are **greatly appreciated**.
+
+> [!IMPORTANT]
+> If you have a suggestion that would make this better, please fork the repo and create a pull request. Don't forget to give the project a star 🌟! I can't stop saying thank you!
+>
+> 1. Fork this project
+> 2. Create your feature branch (`git checkout -b feature/awesome-feature`)
+> 3. Commit your changes (`git commit -m "feat: add awesome feature"`)
+> 4. Push to the branch (`git push origin feature/awesome-feature`)
+> 5. Open a pull request
+
+<p align="right">[ <a href="#readme-top">back to top</a> ]</p>
+
+## 📜 License
+
+The MIT License (MIT). Please see [License File](LICENSE.md) for more information.
+
+<p align="right">[ <a href="#readme-top">back to top</a> ]</p>
diff --git a/env.example b/env.example
new file mode 100644
index 00000000..1f2b0adb
--- /dev/null
+++ b/env.example
@@ -0,0 +1 @@
+PROXY_RESOURCES=[{"method":"LIST","category":"HTTP","url":"","is_checked":true},{"method":"LIST","category":"HTTPS","url":"","is_checked":true},{"method":"LIST","category":"SOCKS4","url":"","is_checked":true},{"method":"LIST","category":"SOCKS5","url":"","is_checked":true},{"method":"SCRAP","category":"HTTP","url":"","is_checked":true},{"method":"SCRAP","category":"HTTPS","url":"","is_checked":true},{"method":"SCRAP","category":"SOCKS4","url":"","is_checked":true},{"method":"SCRAP","category":"SOCKS5","url":"","is_checked":true}]
\ No newline at end of file
diff --git a/go.mod b/go.mod
new file mode 100644
index 00000000..99da4f07
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,9 @@
+module github.com/fyvri/fresh-proxy-list
+
+go 1.22.5
+
+require (
+	github.com/joho/godotenv v1.5.1
+	gopkg.in/yaml.v3 v3.0.1
+	h12.io/socks v1.0.3
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 00000000..1bd955ee
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,12 @@
+github.com/h12w/go-socks5 v0.0.0-20200522160539-76189e178364 h1:5XxdakFhqd9dnXoAZy1Mb2R/DZ6D1e+0bGC/JhucGYI=
+github.com/h12w/go-socks5 v0.0.0-20200522160539-76189e178364/go.mod h1:eDJQioIyy4Yn3MVivT7rv/39gAJTrA7lgmYr8EW950c=
+github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
+github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
+github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2 h1:JhzVVoYvbOACxoUmOs6V/G4D5nPVUW73rKvXxP4XUJc=
+github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2/go.mod h1:iIss55rKnNBTvrwdmkUpLnDpZoAHvWaiq5+iMmen4AE=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+h12.io/socks v1.0.3 h1:Ka3qaQewws4j4/eDQnOdpr4wXsC//dXtWvftlIcCQUo=
+h12.io/socks v1.0.3/go.mod h1:AIhxy1jOId/XCz9BO+EIgNL2rQiPTBNnOfnVnQ+3Eck=
diff --git a/internal/entity/proxy.go b/internal/entity/proxy.go
new file mode 100644
index 00000000..ff0e043c
--- /dev/null
+++ b/internal/entity/proxy.go
@@ -0,0 +1,19 @@
+package entity
+
+type Proxy struct {
+	Category  string  `json:"category" yaml:"category"`
+	Proxy     string  `json:"proxy" yaml:"proxy"`
+	IP        string  `json:"ip"  yaml:"ip"`
+	Port      string  `json:"port" yaml:"port"`
+	TimeTaken float64 `json:"time_taken" yaml:"time_taken"`
+	CheckedAt string  `json:"checked_at" yaml:"checked_at"`
+}
+
+type AdvancedProxy struct {
+	Proxy      string   `json:"proxy" yaml:"proxy"`
+	IP         string   `json:"ip" yaml:"ip"`
+	Port       string   `json:"port" yaml:"port"`
+	TimeTaken  float64  `json:"time_taken" yaml:"time_taken"`
+	CheckedAt  string   `json:"checked_at" yaml:"checked_at"`
+	Categories []string `json:"categories" yaml:"categories"`
+}
diff --git a/internal/entity/proxy_xml.go b/internal/entity/proxy_xml.go
new file mode 100644
index 00000000..b8e444b2
--- /dev/null
+++ b/internal/entity/proxy_xml.go
@@ -0,0 +1,18 @@
+package entity
+
+import "encoding/xml"
+
+type ProxyXMLClassicView struct {
+	XMLName xml.Name `xml:"Proxies"`
+	Proxies []string `xml:"Proxy"`
+}
+
+type ProxyXMLAdvancedView struct {
+	XMLName xml.Name `xml:"Proxies"`
+	Proxies []Proxy  `xml:"Proxy"`
+}
+
+type ProxyXMLAllAdvancedView struct {
+	XMLName xml.Name        `xml:"Proxies"`
+	Proxies []AdvancedProxy `xml:"Proxy"`
+}
diff --git a/internal/entity/source.go b/internal/entity/source.go
new file mode 100644
index 00000000..f9a26853
--- /dev/null
+++ b/internal/entity/source.go
@@ -0,0 +1,32 @@
+package entity
+
+import "encoding/json"
+
+type Source struct {
+	Method    string `json:"method"`
+	Category  string `json:"category"`
+	URL       string `json:"url"`
+	IsChecked bool   `json:"is_checked"`
+}
+
+func (s *Source) UnmarshalJSON(data []byte) error {
+	type Alias Source
+	alias := &struct {
+		IsChecked *bool `json:"is_checked"`
+		*Alias
+	}{
+		Alias: (*Alias)(s),
+	}
+
+	if err := json.Unmarshal(data, &alias); err != nil {
+		return err
+	}
+
+	if alias.IsChecked == nil {
+		s.IsChecked = true
+	} else {
+		s.IsChecked = *alias.IsChecked
+	}
+
+	return nil
+}
diff --git a/internal/infrastructure/config/file_output_extensions.go b/internal/infrastructure/config/file_output_extensions.go
new file mode 100644
index 00000000..d21f8dfa
--- /dev/null
+++ b/internal/infrastructure/config/file_output_extensions.go
@@ -0,0 +1,8 @@
+package config
+
+var FileOutputExtensions = []string{
+	"csv",
+	"json",
+	"xml",
+	"yaml",
+}
diff --git a/internal/infrastructure/config/private_ips.go b/internal/infrastructure/config/private_ips.go
new file mode 100644
index 00000000..936deca8
--- /dev/null
+++ b/internal/infrastructure/config/private_ips.go
@@ -0,0 +1,16 @@
+package config
+
+import (
+	"net"
+)
+
+var PrivateIPs = []net.IPNet{
+	{IP: net.IP{10, 0, 0, 0}, Mask: net.CIDRMask(8, 32)},     // Private range A
+	{IP: net.IP{172, 16, 0, 0}, Mask: net.CIDRMask(12, 32)},  // Private range B
+	{IP: net.IP{192, 168, 0, 0}, Mask: net.CIDRMask(16, 32)}, // Private range C
+	{IP: net.IP{169, 254, 0, 0}, Mask: net.CIDRMask(16, 32)}, // Link-local addresses
+	{IP: net.IP{224, 0, 0, 0}, Mask: net.CIDRMask(4, 32)},    // Multicast addresses
+	{IP: net.IP{240, 0, 0, 0}, Mask: net.CIDRMask(4, 32)},    // Reserved addresses
+	{IP: net.IP{127, 0, 0, 0}, Mask: net.CIDRMask(8, 32)},    // Loopback addresses
+	{IP: net.IP{192, 0, 2, 0}, Mask: net.CIDRMask(24, 32)},   // Documentation Network
+}
diff --git a/internal/infrastructure/config/proxy_categories.go b/internal/infrastructure/config/proxy_categories.go
new file mode 100644
index 00000000..b81ff30a
--- /dev/null
+++ b/internal/infrastructure/config/proxy_categories.go
@@ -0,0 +1,8 @@
+package config
+
+var ProxyCategories = []string{
+	"HTTP",
+	"HTTPS",
+	"SOCKS4",
+	"SOCKS5",
+}
diff --git a/internal/infrastructure/config/special_ips.go b/internal/infrastructure/config/special_ips.go
new file mode 100644
index 00000000..e0dad12a
--- /dev/null
+++ b/internal/infrastructure/config/special_ips.go
@@ -0,0 +1,7 @@
+package config
+
+var SpecialIPs = []string{
+	"0.0.0.0",
+	"127.0.0.1",
+	"255.255.255.255",
+}
diff --git a/internal/infrastructure/config/testing_sites.go b/internal/infrastructure/config/testing_sites.go
new file mode 100644
index 00000000..50a1810d
--- /dev/null
+++ b/internal/infrastructure/config/testing_sites.go
@@ -0,0 +1,18 @@
+package config
+
+var HTTPTestingSites = []string{
+	"http://ifconfig.me/ip",
+	"http://api.ipaddress.com/myip",
+	"http://checkip.amazonaws.com",
+}
+
+var HTTPSTestingSites = []string{
+	"https://ifconfig.me/ip",
+	"https://api.ipaddress.com/myip",
+	"https://checkip.amazonaws.com",
+	"https://google.com",
+	"https://bing.com",
+	"https://yahoo.com",
+	"https://api.ipify.org",
+	"https://ipinfo.io/ip",
+}
diff --git a/internal/infrastructure/config/user_agents.go b/internal/infrastructure/config/user_agents.go
new file mode 100644
index 00000000..39658a63
--- /dev/null
+++ b/internal/infrastructure/config/user_agents.go
@@ -0,0 +1,1003 @@
+package config
+
+var UserAgents = []string{
+	"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/37.0.2062.94 Chrome/37.0.2062.94 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.85 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0",
+	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/600.8.9 (KHTML, like Gecko) Version/8.0.8 Safari/600.8.9",
+	"Mozilla/5.0 (iPad; CPU OS 8_4_1 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12H321 Safari/600.1.4",
+	"Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.85 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.85 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36 Edge/12.10240",
+	"Mozilla/5.0 (Windows NT 6.3; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0",
+	"Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0) like Gecko",
+	"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.85 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Trident/7.0; rv:11.0) like Gecko",
+	"Mozilla/5.0 (Windows NT 10.0; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0",
+	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_4) AppleWebKit/600.7.12 (KHTML, like Gecko) Version/8.0.7 Safari/600.7.12",
+	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.85 Safari/537.36",
+	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:40.0) Gecko/20100101 Firefox/40.0",
+	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_5) AppleWebKit/600.8.9 (KHTML, like Gecko) Version/7.1.8 Safari/537.85.17",
+	"Mozilla/5.0 (iPad; CPU OS 8_4 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12H143 Safari/600.1.4",
+	"Mozilla/5.0 (iPad; CPU OS 8_3 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12F69 Safari/600.1.4",
+	"Mozilla/5.0 (Windows NT 6.1; rv:40.0) Gecko/20100101 Firefox/40.0",
+	"Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)",
+	"Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)",
+	"Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; Touch; rv:11.0) like Gecko",
+	"Mozilla/5.0 (Windows NT 5.1; rv:40.0) Gecko/20100101 Firefox/40.0",
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+	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.118 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 4.4.4; Z970 Build/KTU84P) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/30.0.0.0 Mobile Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 5.1.1; Nexus 5 Build/LMY48I) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.84 Mobile Safari/537.36",
+	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_3) AppleWebKit/534.55.3 (KHTML, like Gecko) Version/5.1.3 Safari/534.53.10",
+	"Mozilla/5.0 (X11; CrOS armv7l 6812.88.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.153 Safari/537.36",
+	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2227.1 Safari/537.36",
+	"Mozilla/5.0 (iPhone; CPU iPhone OS 6_1_3 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/6.0 Mobile/10B329 Safari/8536.25",
+	"Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; MAARJS; rv:11.0) like Gecko",
+	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:36.0) Gecko/20100101 Firefox/36.0",
+	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.155 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.3; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0",
+	"Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; )",
+	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.132 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.3; Win64; x64; Trident/7.0; Touch; MASAJS; rv:11.0) like Gecko",
+	"Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; Touch; MAARJS; rv:11.0) like Gecko",
+	"Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.101 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.101 Safari/537.36",
+	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/537.13+ (KHTML, like Gecko) Version/5.1.7 Safari/534.57.2",
+	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10; rv:33.0) Gecko/20100101 Firefox/33.0",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.134 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36 SE 2.X MetaSr 1.0",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 BIDUBrowser/7.6 Safari/537.36",
+	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; MASMJS; rv:11.0) like Gecko",
+	"Mozilla/5.0 (Windows NT 10.0; Trident/7.0; Touch; rv:11.0) like Gecko",
+	"Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET4.0C; .NET4.0E; 360SE)",
+	"Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; InfoPath.3; .NET4.0C; .NET4.0E; MS-RTC LM 8)",
+	"Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; Touch; MAGWJS; rv:11.0) like Gecko",
+	"Mozilla/5.0 (Linux; Android 5.1.1; SAMSUNG SM-G925T Build/LMY47X) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/3.2 Chrome/38.0.2125.102 Mobile Safari/537.36",
+	"Mozilla/5.0 (X11; CrOS x86_64 6457.107.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.115 Safari/537.36",
+	"Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; 360SE)",
+	"Mozilla/5.0 (iPad; CPU OS 8_4_1 like Mac OS X) AppleWebKit/600.1.4.17.9 (KHTML, like Gecko) Version/5.1 Mobile/9B206 Safari/7534.48.3",
+	"Mozilla/5.0 (Linux; Android 4.2.2; GT-P5113 Build/JDQ39) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.84 Safari/537.36",
+	"Mozilla/5.0 (X11; Linux i686; rv:24.0) Gecko/20100101 Firefox/24.0 DejaClick/2.5.0.11",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.154 Safari/537.36 LBBROWSER",
+	"Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.122 Safari/537.36 SE 2.X MetaSr 1.0",
+	"Mozilla/5.0 (Linux; Android 4.4.3; KFARWI Build/KTU84M) AppleWebKit/537.36 (KHTML, like Gecko) Silk/44.1.81 like Chrome/44.0.2403.128 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.125 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.117 Safari/537.36",
+	"Mozilla/5.0 (iPad; CPU OS 8_1_3 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) GSA/8.0.57838 Mobile/12B466 Safari/600.1.4",
+	"Mozilla/5.0 (Unknown; Linux i686) AppleWebKit/534.34 (KHTML, like Gecko) Chrome/20.0.1132.57 Safari/534.34",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; NP08; MAAU; NP08; rv:11.0) like Gecko",
+	"Mozilla/5.0 (Linux; Android 4.4.2; LG-V410 Build/KOT49I.V41010d) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.84 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.122 Safari/537.36 SE 2.X MetaSr 1.0",
+	"Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; InfoPath.3)",
+	"Mozilla/5.0 (Windows NT 6.1; rv:28.0) Gecko/20100101 Firefox/28.0",
+	"Mozilla/5.0 (X11; CrOS x86_64 6946.70.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.132 Safari/537.36",
+	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.124 Safari/537.36",
+	"Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/6.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.3; .NET4.0C; .NET4.0E)",
+	"Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:33.0) Gecko/20100101 Firefox/33.0",
+	"Mozilla/5.0 (iPod touch; CPU iPhone OS 8_4_1 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12H321 Safari/600.1.4",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 IceDragon/38.0.5 Firefox/38.0.5",
+	"Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.152 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; managedpc; rv:11.0) like Gecko",
+	"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.116 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; Touch; MASMJS; rv:11.0) like Gecko",
+	"Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.111 Safari/537.36",
+	"Mozilla/5.0 (Linux; U; Android 4.0.3; en-ca; KFOT Build/IML74K) AppleWebKit/537.36 (KHTML, like Gecko) Silk/3.68 like Chrome/39.0.2171.93 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 4.2.2; Le Pan TC802A Build/JDQ39) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.84 Safari/537.36",
+	"Mozilla/5.0 (iPad; CPU OS 7_1_2 like Mac OS X) AppleWebKit/537.51.2 (KHTML, like Gecko) GSA/6.0.51363 Mobile/11D257 Safari/9537.53",
+	"Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.152 Safari/537.36 LBBROWSER",
+	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:37.0) Gecko/20100101 Firefox/37.0",
+	"Mozilla/5.0 (Windows NT 6.2; ARM; Trident/7.0; Touch; rv:11.0; WPDesktop; Lumia 1520) like Gecko",
+	"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.65 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64; rv:42.0) Gecko/20100101 Firefox/42.0",
+	"Mozilla/5.0 (iPhone; CPU iPhone OS 7_0_6 like Mac OS X) AppleWebKit/537.51.1 (KHTML, like Gecko) Version/7.0 Mobile/11B651 Safari/9537.53",
+	"Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.2; .NET4.0C; .NET4.0E)",
+	"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET4.0C; .NET4.0E; 360SE)",
+	"Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.103 Safari/537.36",
+	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.125 Safari/537.36",
+	"Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.3; .NET4.0C; .NET4.0E)",
+	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:34.0) Gecko/20100101 Firefox/34.0",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1700.76 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.87 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; PRU_IE; rv:11.0) like Gecko",
+	"Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/37.0.2062.120 Chrome/37.0.2062.120 Safari/537.36",
+	"Mozilla/5.0 (iPad; CPU OS 8_4_1 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Mobile/12H321 [FBAN/FBIOS;FBAV/38.0.0.6.79;FBBV/14316658;FBDV/iPad4,1;FBMD/iPad;FBSN/iPhone OS;FBSV/8.4.1;FBSS/2; FBCR/;FBID/tablet;FBLC/en_US;FBOP/1]",
+	"Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.155 Safari/537.36 OPR/31.0.1889.174",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; NP02; rv:11.0) like Gecko",
+	"Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.111 Safari/537.36",
+	"Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Win64; x64; Trident/4.0; .NET CLR 2.0.50727; SLCC2; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E)",
+	"Mozilla/5.0 (X11; CrOS x86_64 6946.63.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.130 Safari/537.36",
+	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:37.0) Gecko/20100101 Firefox/37.0",
+	"Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.115 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.0.9895 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 4.4.4; Nexus 7 Build/KTU84P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.84 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 4.2.2; QMV7B Build/JDQ39) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.114 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.3; Win64; x64; Trident/7.0; Touch; MASMJS; rv:11.0) like Gecko",
+	"Mozilla/5.0 (compatible; MSIE 10.0; AOL 9.7; AOLBuild 4343.1028; Windows NT 6.1; WOW64; Trident/7.0)",
+	"Mozilla/5.0 (Linux; U; Android 4.0.3; en-us) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.59 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.3; Trident/7.0; Touch; TNJB; rv:11.0) like Gecko",
+	"Mozilla/5.0 (iPad; CPU OS 8_1_3 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Mobile/12B466",
+	"Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; Active Content Browser)",
+	"Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/7.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET4.0C; .NET4.0E)",
+	"Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.130 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.124 Safari/537.36",
+	"Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/6.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; InfoPath.3)",
+	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.81 Safari/537.36",
+	"Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Win64; x64; Trident/6.0; WebView/1.0)",
+	"Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.89 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.130 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.91 Safari/537.36",
+	"Mozilla/5.0 (iPad; U; CPU OS 5_0 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9A334 Safari/7534.48.3",
+	"Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36",
+	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.130 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) coc_coc_browser/50.0.125 Chrome/44.0.2403.125 Safari/537.36",
+	"Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0; SLCC2; .NET CLR 2.0.50727; .NET4.0C; .NET4.0E)",
+	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.124 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.3; Win64; x64; Trident/7.0; MAARJS; rv:11.0) like Gecko",
+	"Mozilla/5.0 (Linux; Android 5.0; SAMSUNG SM-N900T Build/LRX21V) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/2.1 Chrome/34.0.1847.76 Mobile Safari/537.36",
+	"Mozilla/5.0 (iPhone; CPU iPhone OS 8_4 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) GSA/7.0.55539 Mobile/12H143 Safari/600.1.4",
+}
diff --git a/internal/infrastructure/repository/file_repository.go b/internal/infrastructure/repository/file_repository.go
new file mode 100644
index 00000000..b0f595a1
--- /dev/null
+++ b/internal/infrastructure/repository/file_repository.go
@@ -0,0 +1,218 @@
+package repository
+
+import (
+	"encoding/json"
+	"encoding/xml"
+	"fmt"
+	"io"
+	"io/fs"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/fyvri/fresh-proxy-list/internal/entity"
+	"github.com/fyvri/fresh-proxy-list/pkg/utils"
+
+	"gopkg.in/yaml.v3"
+)
+
+type FileRepository struct {
+	MkdirAll  func(path string, perm os.FileMode) error
+	Create    func(name string) (io.Writer, error)
+	CSVWriter utils.CSVWriterUtilInterface
+}
+
+type FileRepositoryInterface interface {
+	SaveFile(filePath string, data interface{}, format string) error
+	CreateDirectory(filePath string) error
+	WriteTxt(writer io.Writer, data interface{}) error
+	EncodeCSV(writer io.Writer, data interface{}) error
+	WriteCSV(writer io.Writer, header []string, rows [][]string) error
+	EncodeJSON(writer io.Writer, data interface{}) error
+	EncodeXML(writer io.Writer, data interface{}) error
+	EncodeYAML(writer io.Writer, data interface{}) error
+}
+
+type MkdirAllFunc func(path string, perm os.FileMode) error
+type CreateFunc func(name string) (io.Writer, error)
+
+func NewFileRepository(mkdirAll MkdirAllFunc, create CreateFunc, csvWriter utils.CSVWriterUtilInterface) FileRepositoryInterface {
+	return &FileRepository{
+		MkdirAll:  mkdirAll,
+		Create:    create,
+		CSVWriter: csvWriter,
+	}
+}
+
+func (r *FileRepository) SaveFile(filePath string, data interface{}, format string) error {
+	if err := r.CreateDirectory(filePath); err != nil {
+		return err
+	}
+
+	file, err := r.Create(filePath)
+	if err != nil {
+		return fmt.Errorf("error creating file %s: %v", filePath, err)
+	}
+	defer func() {
+		if f, ok := file.(io.Closer); ok {
+			f.Close()
+		}
+	}()
+
+	switch format {
+	case "txt":
+		return r.WriteTxt(file, data)
+	case "json":
+		return r.EncodeJSON(file, data)
+	case "csv":
+		return r.EncodeCSV(file, data)
+	case "xml":
+		return r.EncodeXML(file, data)
+	case "yaml":
+		return r.EncodeYAML(file, data)
+	default:
+		return fmt.Errorf("unsupported format: %s", format)
+	}
+}
+
+func (r *FileRepository) CreateDirectory(filePath string) error {
+	err := r.MkdirAll(filepath.Dir(filePath), fs.ModePerm)
+	if err != nil {
+		return fmt.Errorf("error creating directory %s: %v", filePath, err)
+	}
+	return nil
+}
+
+func (r *FileRepository) WriteTxt(writer io.Writer, data interface{}) error {
+	var dataString string
+	if stringData, ok := data.([]string); ok {
+		dataString = strings.Join(stringData, "\n")
+	}
+
+	_, err := writer.Write([]byte(dataString))
+	if err != nil {
+		return fmt.Errorf("error writing TXT: %v", err)
+	}
+	return nil
+}
+
+func (r *FileRepository) EncodeCSV(writer io.Writer, data interface{}) error {
+	switch proxyData := data.(type) {
+	case []string:
+		rows := make([][]string, len(proxyData))
+		for i, rowElem := range proxyData {
+			rows[i] = []string{rowElem}
+		}
+		return r.WriteCSV(writer, nil, rows)
+	case []entity.Proxy:
+		header := []string{"Proxy", "IP", "Port", "TimeTaken", "CheckedAt"}
+		rows := make([][]string, len(proxyData))
+		for i, proxy := range proxyData {
+			rows[i] = []string{proxy.Proxy, proxy.IP, proxy.Port, fmt.Sprintf("%v", proxy.TimeTaken), proxy.CheckedAt}
+		}
+		return r.WriteCSV(writer, header, rows)
+	case []entity.AdvancedProxy:
+		header := []string{"Proxy", "IP", "Port", "Categories", "TimeTaken", "CheckedAt"}
+		rows := make([][]string, len(proxyData))
+		for i, proxy := range proxyData {
+			rows[i] = []string{proxy.Proxy, proxy.IP, proxy.Port, strings.Join(proxy.Categories, ","), fmt.Sprintf("%v", proxy.TimeTaken), proxy.CheckedAt}
+		}
+		return r.WriteCSV(writer, header, rows)
+	default:
+		return fmt.Errorf("invalid data type for CSV encoding")
+	}
+}
+
+func (r *FileRepository) WriteCSV(writer io.Writer, header []string, rows [][]string) error {
+	csvWriter := r.CSVWriter.Init(writer)
+	defer r.CSVWriter.Flush(csvWriter)
+
+	if header != nil {
+		if err := r.CSVWriter.Write(csvWriter, header); err != nil {
+			return fmt.Errorf("failed to write header: %w", err)
+		}
+	}
+
+	for _, row := range rows {
+		if err := r.CSVWriter.Write(csvWriter, row); err != nil {
+			return fmt.Errorf("failed to write row: %w", err)
+		}
+	}
+
+	return nil
+}
+
+func (r *FileRepository) EncodeJSON(writer io.Writer, data interface{}) error {
+	err := json.NewEncoder(writer).Encode(data)
+	if err != nil {
+		return fmt.Errorf("error encoding JSON: %v", err)
+	}
+	return nil
+}
+
+func (r *FileRepository) EncodeXML(writer io.Writer, data interface{}) error {
+	var err error
+	switch proxyData := data.(type) {
+	case []string:
+		view := entity.ProxyXMLClassicView{
+			XMLName: xml.Name{Local: "proxies"},
+			Proxies: make([]string, len(proxyData)),
+		}
+		copy(view.Proxies, proxyData)
+		err = xml.NewEncoder(writer).Encode(view)
+	case []entity.Proxy:
+		view := entity.ProxyXMLAdvancedView{
+			XMLName: xml.Name{Local: "proxies"},
+			Proxies: make([]entity.Proxy, len(proxyData)),
+		}
+		copy(view.Proxies, proxyData)
+		err = xml.NewEncoder(writer).Encode(view)
+	case []entity.AdvancedProxy:
+		view := entity.ProxyXMLAllAdvancedView{
+			XMLName: xml.Name{Local: "Proxies"},
+			Proxies: make([]entity.AdvancedProxy, len(proxyData)),
+		}
+		copy(view.Proxies, proxyData)
+		err = xml.NewEncoder(writer).Encode(view)
+	}
+
+	if err != nil {
+		return fmt.Errorf("error encoding XML: %v", err)
+	}
+	return nil
+}
+
+func (r *FileRepository) EncodeYAML(writer io.Writer, data interface{}) error {
+	var err error
+	switch proxyData := data.(type) {
+	case []string:
+		view := struct {
+			Proxies []string `yaml:"proxies"`
+		}{
+			Proxies: make([]string, len(proxyData)),
+		}
+		copy(view.Proxies, proxyData)
+		err = yaml.NewEncoder(writer).Encode(view)
+	case []entity.Proxy:
+		view := struct {
+			Proxies []entity.Proxy `yaml:"proxies"`
+		}{
+			Proxies: make([]entity.Proxy, len(proxyData)),
+		}
+		copy(view.Proxies, proxyData)
+		err = yaml.NewEncoder(writer).Encode(view)
+	case []entity.AdvancedProxy:
+		view := struct {
+			Proxies []entity.AdvancedProxy `yaml:"proxies"`
+		}{
+			Proxies: make([]entity.AdvancedProxy, len(proxyData)),
+		}
+		copy(view.Proxies, proxyData)
+		err = yaml.NewEncoder(writer).Encode(view)
+	}
+
+	if err != nil {
+		return fmt.Errorf("error encoding YAML: %v", err)
+	}
+	return nil
+}
diff --git a/internal/infrastructure/repository/proxy_repository.go b/internal/infrastructure/repository/proxy_repository.go
new file mode 100644
index 00000000..96c1a8c1
--- /dev/null
+++ b/internal/infrastructure/repository/proxy_repository.go
@@ -0,0 +1,132 @@
+package repository
+
+import (
+	"cmp"
+	"slices"
+	"sync"
+
+	"github.com/fyvri/fresh-proxy-list/internal/entity"
+)
+
+type ProxyRepository struct {
+	Mutex              sync.RWMutex
+	AllClassicView     []string
+	HTTPClassicView    []string
+	HTTPSClassicView   []string
+	SOCKS4ClassicView  []string
+	SOCKS5ClassicView  []string
+	AllAdvancedView    []entity.AdvancedProxy
+	HTTPAdvancedView   []entity.Proxy
+	HTTPSAdvancedView  []entity.Proxy
+	SOCKS4AdvancedView []entity.Proxy
+	SOCKS5AdvancedView []entity.Proxy
+}
+
+type ProxyRepositoryInterface interface {
+	Store(proxy *entity.Proxy)
+	GetAllClassicView() []string
+	GetHTTPClassicView() []string
+	GetHTTPSClassicView() []string
+	GetSOCKS4ClassicView() []string
+	GetSOCKS5ClassicView() []string
+	GetAllAdvancedView() []entity.AdvancedProxy
+	GetHTTPAdvancedView() []entity.Proxy
+	GetHTTPSAdvancedView() []entity.Proxy
+	GetSOCKS4AdvancedView() []entity.Proxy
+	GetSOCKS5AdvancedView() []entity.Proxy
+}
+
+func NewProxyRepository() ProxyRepositoryInterface {
+	return &ProxyRepository{
+		Mutex: sync.RWMutex{},
+	}
+}
+
+func (r *ProxyRepository) Store(proxy *entity.Proxy) {
+	r.Mutex.Lock()
+	defer r.Mutex.Unlock()
+
+	updateProxyAll := func(proxy *entity.Proxy, classicList *[]string, advancedList *[]entity.AdvancedProxy) {
+		n, found := slices.BinarySearchFunc(*advancedList, entity.AdvancedProxy{Proxy: proxy.Proxy}, func(a, b entity.AdvancedProxy) int {
+			return cmp.Compare(a.Proxy, b.Proxy)
+		})
+		if found {
+			if proxy.Category == "HTTP" && proxy.TimeTaken > 0 {
+				(*advancedList)[n].TimeTaken = proxy.TimeTaken
+			}
+
+			if m, found := slices.BinarySearch((*advancedList)[n].Categories, proxy.Category); !found {
+				(*advancedList)[n].Categories = slices.Insert((*advancedList)[n].Categories, m, proxy.Category)
+			}
+		} else {
+			*classicList = append(*classicList, proxy.Proxy)
+			*advancedList = slices.Insert(*advancedList, n, entity.AdvancedProxy{
+				Proxy:     proxy.Proxy,
+				IP:        proxy.IP,
+				Port:      proxy.Port,
+				TimeTaken: proxy.TimeTaken,
+				CheckedAt: proxy.CheckedAt,
+				Categories: []string{
+					proxy.Category,
+				},
+			})
+		}
+	}
+
+	switch proxy.Category {
+	case "HTTP":
+		r.HTTPClassicView = append(r.HTTPClassicView, proxy.Proxy)
+		r.HTTPAdvancedView = append(r.HTTPAdvancedView, *proxy)
+	case "HTTPS":
+		r.HTTPSClassicView = append(r.HTTPSClassicView, proxy.Proxy)
+		r.HTTPSAdvancedView = append(r.HTTPSAdvancedView, *proxy)
+	case "SOCKS4":
+		r.SOCKS4ClassicView = append(r.SOCKS4ClassicView, proxy.Proxy)
+		r.SOCKS4AdvancedView = append(r.SOCKS4AdvancedView, *proxy)
+	case "SOCKS5":
+		r.SOCKS5ClassicView = append(r.SOCKS5ClassicView, proxy.Proxy)
+		r.SOCKS5AdvancedView = append(r.SOCKS5AdvancedView, *proxy)
+	}
+
+	updateProxyAll(proxy, &r.AllClassicView, &r.AllAdvancedView)
+}
+
+func (r *ProxyRepository) GetAllClassicView() []string {
+	return r.AllClassicView
+}
+
+func (r *ProxyRepository) GetHTTPClassicView() []string {
+	return r.HTTPClassicView
+}
+
+func (r *ProxyRepository) GetHTTPSClassicView() []string {
+	return r.HTTPSClassicView
+}
+
+func (r *ProxyRepository) GetSOCKS4ClassicView() []string {
+	return r.SOCKS4ClassicView
+}
+
+func (r *ProxyRepository) GetSOCKS5ClassicView() []string {
+	return r.SOCKS5ClassicView
+}
+
+func (r *ProxyRepository) GetAllAdvancedView() []entity.AdvancedProxy {
+	return r.AllAdvancedView
+}
+
+func (r *ProxyRepository) GetHTTPAdvancedView() []entity.Proxy {
+	return r.HTTPAdvancedView
+}
+
+func (r *ProxyRepository) GetHTTPSAdvancedView() []entity.Proxy {
+	return r.HTTPSAdvancedView
+}
+
+func (r *ProxyRepository) GetSOCKS4AdvancedView() []entity.Proxy {
+	return r.SOCKS4AdvancedView
+}
+
+func (r *ProxyRepository) GetSOCKS5AdvancedView() []entity.Proxy {
+	return r.SOCKS5AdvancedView
+}
diff --git a/internal/infrastructure/repository/source_repository.go b/internal/infrastructure/repository/source_repository.go
new file mode 100644
index 00000000..c421ff1e
--- /dev/null
+++ b/internal/infrastructure/repository/source_repository.go
@@ -0,0 +1,38 @@
+package repository
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+
+	"github.com/fyvri/fresh-proxy-list/internal/entity"
+)
+
+type SourceRepository struct {
+	ProxyResources string
+}
+
+type SourceRepositoryInterface interface {
+	LoadSources() ([]entity.Source, error)
+}
+
+func NewSourceRepository(proxyResources string) SourceRepositoryInterface {
+	return &SourceRepository{
+		ProxyResources: proxyResources,
+	}
+}
+
+func (r *SourceRepository) LoadSources() ([]entity.Source, error) {
+	sourcesJSON := r.ProxyResources
+	if sourcesJSON == "" {
+		return nil, errors.New("PROXY_RESOURCES not found on environment")
+	}
+
+	var sources []entity.Source
+	err := json.Unmarshal([]byte(sourcesJSON), &sources)
+	if err != nil {
+		return nil, fmt.Errorf("error parsing JSON: %v", err)
+	}
+
+	return sources, nil
+}
diff --git a/internal/service/proxy_service.go b/internal/service/proxy_service.go
new file mode 100644
index 00000000..ba7b910d
--- /dev/null
+++ b/internal/service/proxy_service.go
@@ -0,0 +1,142 @@
+package service
+
+import (
+	"crypto/tls"
+	"fmt"
+	"math/rand"
+	"net"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/fyvri/fresh-proxy-list/internal/entity"
+	"github.com/fyvri/fresh-proxy-list/pkg/utils"
+
+	"h12.io/socks"
+)
+
+type ProxyService struct {
+	FetcherUtil       utils.FetcherUtilInterface
+	URLParserUtil     utils.URLParserUtilInterface
+	HTTPTestingSites  []string
+	HTTPSTestingSites []string
+	UserAgents        []string
+	Semaphore         chan struct{}
+}
+
+type ProxyServiceInterface interface {
+	Check(category string, ip string, port string) (*entity.Proxy, error)
+	GetTestingSite(category string) string
+	GetRandomUserAgent() string
+}
+
+func NewProxyService(
+	fetcherUtil utils.FetcherUtilInterface,
+	urlParserUtil utils.URLParserUtilInterface,
+	httpTestingSites []string,
+	httpsTestingSites []string,
+	userAgents []string,
+) ProxyServiceInterface {
+	return &ProxyService{
+		FetcherUtil:       fetcherUtil,
+		URLParserUtil:     urlParserUtil,
+		HTTPTestingSites:  httpTestingSites,
+		HTTPSTestingSites: httpsTestingSites,
+		UserAgents:        userAgents,
+		Semaphore:         make(chan struct{}, 500),
+	}
+}
+
+func (s *ProxyService) Check(category string, ip string, port string) (*entity.Proxy, error) {
+	s.Semaphore <- struct{}{}
+	defer func() { <-s.Semaphore }()
+
+	var (
+		transport   *http.Transport
+		proxy       = ip + ":" + port
+		proxyURI    = strings.ToLower(category + "://" + proxy)
+		testingSite = s.GetTestingSite(category)
+		timeout     = 60 * time.Second
+	)
+
+	if category == "HTTP" || category == "HTTPS" {
+		proxyURL, err := s.URLParserUtil.Parse(proxyURI)
+		if err != nil {
+			return nil, fmt.Errorf("error parsing proxy URL: %v", err)
+		}
+
+		transport = &http.Transport{
+			Proxy:             http.ProxyURL(proxyURL),
+			DisableKeepAlives: true,
+			DialContext: (&net.Dialer{
+				Timeout:   timeout,
+				KeepAlive: timeout,
+			}).DialContext,
+			TLSHandshakeTimeout: timeout,
+			TLSClientConfig: &tls.Config{
+				InsecureSkipVerify: category == "HTTPS",
+			},
+		}
+	} else if category == "SOCKS4" || category == "SOCKS5" {
+		proxyURL := socks.Dial(proxyURI)
+		transport = &http.Transport{
+			Dial:              proxyURL,
+			DisableKeepAlives: true,
+			DialContext: (&net.Dialer{
+				Timeout:   timeout,
+				KeepAlive: timeout,
+			}).DialContext,
+		}
+	} else {
+		return nil, fmt.Errorf("proxy category %s not supported", category)
+	}
+
+	req, err := s.FetcherUtil.NewRequest("GET", testingSite, nil)
+	if err != nil {
+		return nil, fmt.Errorf("error creating request: %s", err)
+	}
+	req.Header.Set("User-Agent", s.GetRandomUserAgent())
+
+	startTime := time.Now()
+	resp, err := s.FetcherUtil.Do(&http.Client{
+		Transport: transport,
+		Timeout:   timeout,
+	}, req)
+
+	// statusCode := ""
+	// if err == nil {
+	// 	statusCode = http.StatusText(resp.StatusCode)
+	// }
+	// log.Printf("Check %s: %s ~> %s ~> %v", fmt.Sprintf("%-25s", proxy), fmt.Sprintf("%-30s", statusCode), testingSite, err)
+
+	if err != nil {
+		return nil, fmt.Errorf("request error: %s", err)
+	}
+	defer resp.Body.Close()
+	endTime := time.Now()
+	timeTaken := endTime.Sub(startTime).Seconds()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("unexpected status code %d: %s", resp.StatusCode, http.StatusText(resp.StatusCode))
+	}
+
+	return &entity.Proxy{
+		Proxy:     proxy,
+		IP:        ip,
+		Port:      port,
+		Category:  category,
+		CheckedAt: endTime.Format(time.RFC3339),
+		TimeTaken: timeTaken,
+	}, nil
+}
+
+func (s *ProxyService) GetTestingSite(category string) string {
+	if category == "HTTPS" {
+		return s.HTTPSTestingSites[rand.Intn(len(s.HTTPSTestingSites))]
+	}
+	return s.HTTPTestingSites[rand.Intn(len(s.HTTPTestingSites))]
+}
+
+func (s *ProxyService) GetRandomUserAgent() string {
+	return s.UserAgents[rand.Intn(len(s.UserAgents))]
+}
diff --git a/internal/usecase/file_usecase.go b/internal/usecase/file_usecase.go
new file mode 100644
index 00000000..81976e70
--- /dev/null
+++ b/internal/usecase/file_usecase.go
@@ -0,0 +1,59 @@
+package usecase
+
+import (
+	"path/filepath"
+	"strings"
+	"sync"
+
+	"github.com/fyvri/fresh-proxy-list/internal/infrastructure/repository"
+)
+
+type fileUsecase struct {
+	FileRepository       repository.FileRepositoryInterface
+	ProxyRepository      repository.ProxyRepositoryInterface
+	FileOutputExtensions []string
+	WaitGroup            sync.WaitGroup
+}
+
+type FileUsecaseInterface interface {
+	SaveFiles()
+}
+
+func NewFileUsecase(fileRepository repository.FileRepositoryInterface, proxyRepository repository.ProxyRepositoryInterface, fileOutputExtensions []string) FileUsecaseInterface {
+	return &fileUsecase{
+		FileRepository:       fileRepository,
+		ProxyRepository:      proxyRepository,
+		FileOutputExtensions: fileOutputExtensions,
+		WaitGroup:            sync.WaitGroup{},
+	}
+}
+
+func (uc *fileUsecase) SaveFiles() {
+	createFile := func(filename string, classic []string, advanced interface{}) {
+		uc.WaitGroup.Add((len(uc.FileOutputExtensions) * 2) + 1)
+
+		filename = strings.ToLower(filename)
+		for _, ext := range uc.FileOutputExtensions {
+			go func(ext string) {
+				defer uc.WaitGroup.Done()
+				uc.FileRepository.SaveFile(filepath.Join("storage", "classic", filename+"."+ext), classic, ext)
+			}(ext)
+			go func(ext string) {
+				defer uc.WaitGroup.Done()
+				uc.FileRepository.SaveFile(filepath.Join("storage", "advanced", filename+"."+ext), advanced, ext)
+			}(ext)
+		}
+
+		go func() {
+			defer uc.WaitGroup.Done()
+			uc.FileRepository.SaveFile(filepath.Join("storage", "classic", filename+".txt"), classic, "txt")
+		}()
+	}
+
+	createFile("all", uc.ProxyRepository.GetAllClassicView(), uc.ProxyRepository.GetAllAdvancedView())
+	createFile("http", uc.ProxyRepository.GetHTTPClassicView(), uc.ProxyRepository.GetHTTPAdvancedView())
+	createFile("https", uc.ProxyRepository.GetHTTPSClassicView(), uc.ProxyRepository.GetHTTPSAdvancedView())
+	createFile("socks4", uc.ProxyRepository.GetSOCKS4ClassicView(), uc.ProxyRepository.GetSOCKS4AdvancedView())
+	createFile("socks5", uc.ProxyRepository.GetSOCKS5ClassicView(), uc.ProxyRepository.GetSOCKS5AdvancedView())
+	uc.WaitGroup.Wait()
+}
diff --git a/internal/usecase/proxy_usecase.go b/internal/usecase/proxy_usecase.go
new file mode 100644
index 00000000..d897c8cc
--- /dev/null
+++ b/internal/usecase/proxy_usecase.go
@@ -0,0 +1,126 @@
+package usecase
+
+import (
+	"fmt"
+	"net"
+	"regexp"
+	"slices"
+	"strconv"
+	"strings"
+	"sync"
+
+	"github.com/fyvri/fresh-proxy-list/internal/entity"
+	"github.com/fyvri/fresh-proxy-list/internal/infrastructure/repository"
+	"github.com/fyvri/fresh-proxy-list/internal/service"
+)
+
+type ProxyUsecase struct {
+	ProxyRepository repository.ProxyRepositoryInterface
+	ProxyService    service.ProxyServiceInterface
+	ProxyMap        sync.Map
+	SpecialIPs      []string
+	PrivateIPs      []net.IPNet
+}
+
+type ProxyUsecaseInterface interface {
+	ProcessProxy(category string, proxy string, isChecked bool) (*entity.Proxy, error)
+	IsSpecialIP(ip string) bool
+	GetAllAdvancedView() []entity.AdvancedProxy
+}
+
+func NewProxyUsecase(
+	proxyRepository repository.ProxyRepositoryInterface,
+	proxyService service.ProxyServiceInterface,
+	specialIPs []string,
+	privateIPs []net.IPNet,
+) ProxyUsecaseInterface {
+	return &ProxyUsecase{
+		ProxyRepository: proxyRepository,
+		ProxyService:    proxyService,
+		SpecialIPs:      specialIPs,
+		PrivateIPs:      privateIPs,
+		ProxyMap:        sync.Map{},
+	}
+}
+
+func (uc *ProxyUsecase) ProcessProxy(category string, proxy string, isChecked bool) (*entity.Proxy, error) {
+	proxy = strings.TrimSpace(strings.ReplaceAll(strings.ReplaceAll(proxy, "\r", ""), "\n", ""))
+	if proxy == "" {
+		return nil, fmt.Errorf("proxy not found")
+	}
+
+	proxyParts := strings.Split(proxy, ":")
+	if len(proxyParts) != 2 {
+		return nil, fmt.Errorf("proxy format incorrect")
+	}
+
+	pattern := `^((25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)\:(0|[1-9][0-9]{0,4})$`
+	re := regexp.MustCompile(pattern)
+	if !re.MatchString(proxy) {
+		return nil, fmt.Errorf("proxy format not match")
+	}
+
+	if uc.IsSpecialIP(proxyParts[0]) {
+		return nil, fmt.Errorf("proxy belongs to special ip")
+	}
+
+	port, err := strconv.Atoi(proxyParts[1])
+	if err != nil || port < 0 || port > 65535 {
+		return nil, fmt.Errorf("proxy port format incorrect")
+	}
+
+	_, loaded := uc.ProxyMap.LoadOrStore(category+"_"+proxy, true)
+	if loaded {
+		return nil, fmt.Errorf("proxy has been processed")
+	}
+
+	var (
+		data               *entity.Proxy
+		proxyIP, proxyPort = proxyParts[0], proxyParts[1]
+	)
+	if isChecked {
+		data, err = uc.ProxyService.Check(category, proxyIP, proxyPort)
+		if err != nil {
+			return nil, err
+		}
+	} else {
+		data = &entity.Proxy{
+			Proxy:     proxy,
+			IP:        proxyIP,
+			Port:      proxyPort,
+			Category:  category,
+			TimeTaken: 0,
+			CheckedAt: "",
+		}
+	}
+	uc.ProxyRepository.Store(data)
+
+	return data, nil
+}
+
+func (uc *ProxyUsecase) IsSpecialIP(ip string) bool {
+	if _, found := slices.BinarySearch(uc.SpecialIPs, ip); found {
+		return true
+	}
+
+	ipAddress := net.ParseIP(ip)
+	if ipAddress == nil {
+		return true
+	}
+
+	if ipAddress.IsLoopback() || ipAddress.IsMulticast() || ipAddress.IsUnspecified() {
+		return true
+	}
+
+	for _, r := range uc.PrivateIPs {
+		if r.Contains(ipAddress) {
+			return true
+		}
+	}
+
+	return false
+}
+
+func (uc *ProxyUsecase) GetAllAdvancedView() []entity.AdvancedProxy {
+	return uc.ProxyRepository.GetAllAdvancedView()
+}
diff --git a/internal/usecase/source_usecase.go b/internal/usecase/source_usecase.go
new file mode 100644
index 00000000..896f4e4f
--- /dev/null
+++ b/internal/usecase/source_usecase.go
@@ -0,0 +1,52 @@
+package usecase
+
+import (
+	"fmt"
+	"regexp"
+	"strings"
+
+	"github.com/fyvri/fresh-proxy-list/internal/entity"
+	"github.com/fyvri/fresh-proxy-list/internal/infrastructure/repository"
+	"github.com/fyvri/fresh-proxy-list/pkg/utils"
+)
+
+type SourceUsecase struct {
+	SourceRepository repository.SourceRepositoryInterface
+	FetcherUtil      utils.FetcherUtilInterface
+}
+
+type SourceUsecaseInterface interface {
+	LoadSources() ([]entity.Source, error)
+	ProcessSource(source *entity.Source) ([]string, error)
+}
+
+func NewSourceUsecase(sourceRepository repository.SourceRepositoryInterface, fetcherUtil utils.FetcherUtilInterface) SourceUsecaseInterface {
+	return &SourceUsecase{
+		SourceRepository: sourceRepository,
+		FetcherUtil:      fetcherUtil,
+	}
+}
+
+func (uc *SourceUsecase) LoadSources() ([]entity.Source, error) {
+	return uc.SourceRepository.LoadSources()
+}
+
+func (uc *SourceUsecase) ProcessSource(source *entity.Source) ([]string, error) {
+	body, err := uc.FetcherUtil.FetchData(source.URL)
+	if err != nil {
+		return nil, err
+	}
+
+	var proxies []string
+	switch source.Method {
+	case "LIST":
+		proxies = strings.Split(strings.TrimSpace(string(body)), "\n")
+	case "SCRAP":
+		re := regexp.MustCompile(`[0-9]+(?:\.[0-9]+){3}:[0-9]+`)
+		proxies = re.FindAllString(string(body), -1)
+	default:
+		return nil, fmt.Errorf("source method not found: %s", source.Method)
+	}
+
+	return proxies, nil
+}
diff --git a/pkg/utils/csv_writer_util.go b/pkg/utils/csv_writer_util.go
new file mode 100644
index 00000000..001b6e31
--- /dev/null
+++ b/pkg/utils/csv_writer_util.go
@@ -0,0 +1,31 @@
+package utils
+
+import (
+	"encoding/csv"
+	"io"
+)
+
+type CSVWriterUtil struct {
+}
+
+type CSVWriterUtilInterface interface {
+	Init(w io.Writer) *csv.Writer
+	Flush(csvWriter *csv.Writer)
+	Write(csvWriter *csv.Writer, record []string) error
+}
+
+func NewCSVWriter() CSVWriterUtilInterface {
+	return &CSVWriterUtil{}
+}
+
+func (u *CSVWriterUtil) Init(w io.Writer) *csv.Writer {
+	return csv.NewWriter(w)
+}
+
+func (u *CSVWriterUtil) Flush(csvWriter *csv.Writer) {
+	csvWriter.Flush()
+}
+
+func (u *CSVWriterUtil) Write(csvWriter *csv.Writer, record []string) error {
+	return csvWriter.Write(record)
+}
diff --git a/pkg/utils/fetcher_util.go b/pkg/utils/fetcher_util.go
new file mode 100644
index 00000000..4a2b43ae
--- /dev/null
+++ b/pkg/utils/fetcher_util.go
@@ -0,0 +1,58 @@
+package utils
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+)
+
+type FetcherUtil struct {
+	Client         *http.Client
+	NewRequestFunc func(method string, url string, body io.Reader) (*http.Request, error)
+}
+
+type FetcherUtilInterface interface {
+	NewRequest(method, url string, body io.Reader) (*http.Request, error)
+	Do(client *http.Client, req *http.Request) (*http.Response, error)
+	FetchData(url string) ([]byte, error)
+}
+
+func NewFetcher(client *http.Client, newRequestFunc func(method, url string, body io.Reader) (*http.Request, error)) FetcherUtilInterface {
+	return &FetcherUtil{
+		Client:         client,
+		NewRequestFunc: newRequestFunc,
+	}
+}
+
+func (u *FetcherUtil) Do(client *http.Client, req *http.Request) (*http.Response, error) {
+	return client.Do(req)
+}
+
+func (u *FetcherUtil) NewRequest(method string, url string, body io.Reader) (*http.Request, error) {
+	return http.NewRequest(method, url, body)
+}
+
+func (u *FetcherUtil) FetchData(url string) ([]byte, error) {
+	req, err := u.NewRequestFunc("GET", url, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err := u.Do(u.Client, req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		body, _ := io.ReadAll(resp.Body)
+		return body, fmt.Errorf("failed to fetch data: %s", http.StatusText(resp.StatusCode))
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	return body, nil
+}
diff --git a/pkg/utils/url_parser_util.go b/pkg/utils/url_parser_util.go
new file mode 100644
index 00000000..0d7c4d7a
--- /dev/null
+++ b/pkg/utils/url_parser_util.go
@@ -0,0 +1,19 @@
+package utils
+
+import (
+	"net/url"
+)
+
+type URLParserUtil struct{}
+
+type URLParserUtilInterface interface {
+	Parse(rawURL string) (*url.URL, error)
+}
+
+func NewURLParser() URLParserUtilInterface {
+	return &URLParserUtil{}
+}
+
+func (u *URLParserUtil) Parse(rawURL string) (*url.URL, error) {
+	return url.Parse(rawURL)
+}
diff --git a/test/unit/internal/entity/source_test.go b/test/unit/internal/entity/source_test.go
new file mode 100644
index 00000000..378afde1
--- /dev/null
+++ b/test/unit/internal/entity/source_test.go
@@ -0,0 +1,127 @@
+package entity_test
+
+import (
+	"encoding/json"
+	"strconv"
+	"testing"
+
+	"github.com/fyvri/fresh-proxy-list/internal/entity"
+)
+
+var (
+	expectedButGotMessage      = "Expected %v = %v, but got = %v"
+	expectedErrorButGotMessage = "Expected %v error = %v, but got = %v"
+	testMethod                 = "LIST"
+	testCategory               = "HTTP"
+	testURL                    = "http://example.com"
+	testIsChecked              = false
+)
+
+func TestUnmarshalJSONWithIsChecked(t *testing.T) {
+	var (
+		source = entity.Source{}
+		data   = []byte(`{
+			"method": "` + testMethod + `",
+			"category": "` + testCategory + `",
+			"url": "` + testURL + `",
+			"is_checked": ` + strconv.FormatBool(testIsChecked) + `
+		}`)
+	)
+	err := json.Unmarshal(data, &source)
+
+	if err != nil {
+		t.Errorf(expectedErrorButGotMessage, "unmarshal", nil, err)
+	}
+
+	if source.Method != testMethod {
+		t.Errorf(expectedButGotMessage, "method", testMethod, source.Method)
+	}
+
+	if source.Category != testCategory {
+		t.Errorf(expectedButGotMessage, "category", testCategory, source.Category)
+	}
+
+	if source.URL != testURL {
+		t.Errorf(expectedButGotMessage, "url", testURL, source.Category)
+	}
+
+	if source.IsChecked != testIsChecked {
+		t.Errorf(expectedButGotMessage, "is_checked", testIsChecked, source.IsChecked)
+	}
+}
+
+func TestUnmarshalJSONWithoutIsChecked(t *testing.T) {
+	var (
+		source = entity.Source{}
+		data   = []byte(`{
+			"method": "` + testMethod + `",
+			"category": "` + testCategory + `",
+			"url": "` + testURL + `"
+		}`)
+	)
+	err := json.Unmarshal(data, &source)
+
+	if err != nil {
+		t.Errorf(expectedErrorButGotMessage, "unmarshal", nil, err)
+	}
+
+	if source.Method != testMethod {
+		t.Errorf(expectedButGotMessage, "method", testMethod, source.Method)
+	}
+
+	if source.Category != testCategory {
+		t.Errorf(expectedButGotMessage, "category", testCategory, source.Category)
+	}
+
+	if source.URL != testURL {
+		t.Errorf(expectedButGotMessage, "url", testURL, source.Category)
+	}
+
+	if source.IsChecked != true {
+		t.Errorf(expectedButGotMessage, "is_checked", true, source.IsChecked)
+	}
+}
+
+func TestUnmarshalJSONWithInvalidData(t *testing.T) {
+	var (
+		source = entity.Source{}
+		data   = []byte(`{
+			"method": "` + testMethod + `",
+			"category": "` + testCategory + `",
+			"url": "` + testURL + `",
+			"is_checked": "string_instead_of_bool"
+		}`)
+	)
+	err := json.Unmarshal(data, &source)
+	if err == nil {
+		t.Errorf(expectedButGotMessage, "unmarshal", "any error", err)
+	}
+}
+
+func TestUnmarshalJSONWithEmptyData(t *testing.T) {
+	var (
+		source = entity.Source{}
+		data   = []byte(`{}`)
+	)
+	err := json.Unmarshal(data, &source)
+
+	if err != nil {
+		t.Errorf(expectedErrorButGotMessage, "unmarshal", nil, err)
+	}
+
+	if source.Method != "" {
+		t.Errorf(expectedButGotMessage, "method", "empty", source.Method)
+	}
+
+	if source.Category != "" {
+		t.Errorf(expectedButGotMessage, "category", "empty", source.Category)
+	}
+
+	if source.URL != "" {
+		t.Errorf(expectedButGotMessage, "url", "empty", source.Category)
+	}
+
+	if source.IsChecked != true {
+		t.Errorf(expectedButGotMessage, "is_checked", true, source.IsChecked)
+	}
+}
diff --git a/test/unit/internal/infrastructure/repository/file_repository_test.go b/test/unit/internal/infrastructure/repository/file_repository_test.go
new file mode 100644
index 00000000..62f31a43
--- /dev/null
+++ b/test/unit/internal/infrastructure/repository/file_repository_test.go
@@ -0,0 +1,531 @@
+package repository_test
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"io/fs"
+	"os"
+	"strings"
+	"testing"
+
+	"github.com/fyvri/fresh-proxy-list/internal/infrastructure/repository"
+	"github.com/fyvri/fresh-proxy-list/pkg/utils"
+)
+
+var (
+	column1     = "Column1"
+	column2     = "Column2"
+	row1Column1 = "Row1Column1"
+	row1Column2 = "Row1Column2"
+	row2Column1 = "Row2Column1"
+	row2Column2 = "Row2Column2"
+)
+
+func TestNewFileRepository(t *testing.T) {
+	mockMkdirAll := func(path string, perm fs.FileMode) error {
+		if path == "" {
+			return errors.New("path cannot be empty")
+		}
+		return nil
+	}
+	mockCreate := func(name string) (io.Writer, error) {
+		if name == "" {
+			return nil, errors.New("file name cannot be empty")
+		}
+		return &bytes.Buffer{}, nil
+	}
+	mockCSVWriterUtil := &mockCSVWriterUtil{}
+	fileRepository := repository.NewFileRepository(mockMkdirAll, mockCreate, mockCSVWriterUtil)
+
+	if fileRepository == nil {
+		t.Errorf(expectedReturnNonNil, "NewFileRepository", "FileRepositoryInterface")
+	}
+
+	r, ok := fileRepository.(*repository.FileRepository)
+	if !ok {
+		t.Errorf(expectedTypeAssertionErrorMessage, "*FileRepository")
+	}
+
+	if r.MkdirAll == nil {
+		t.Errorf("expected mkdirAll to be set")
+	}
+
+	if r.Create == nil {
+		t.Errorf("expected create to be set")
+	}
+}
+
+func TestSaveFile(t *testing.T) {
+	type fields struct {
+		mkdirAll  func(path string, perm os.FileMode) error
+		create    func(name string) (io.Writer, error)
+		csvWriter utils.CSVWriterUtilInterface
+	}
+
+	type args struct {
+		path   string
+		data   interface{}
+		format string
+	}
+
+	tests := []struct {
+		name      string
+		fields    fields
+		args      args
+		want      string
+		wantError error
+	}{
+		{
+			name: "CreateDirectoryError",
+			fields: fields{
+				mkdirAll: func(path string, perm os.FileMode) error {
+					return errors.New("error creating directory")
+				},
+				create: func(name string) (io.Writer, error) {
+					return nil, nil
+				},
+			},
+			args: args{
+				path:   testClassicFilePath + "." + testTXTExtension,
+				data:   strings.Join(testIPs, "\n"),
+				format: testTXTExtension,
+			},
+			want:      "",
+			wantError: fmt.Errorf("error creating directory %v: %v", testClassicFilePath+"."+testTXTExtension, "error creating directory"),
+		},
+		{
+			name: "CreateFileError",
+			fields: fields{
+				mkdirAll: func(path string, perm os.FileMode) error {
+					return nil
+				},
+				create: func(name string) (io.Writer, error) {
+					return nil, errors.New("error creating file")
+				},
+			},
+			args: args{
+				path:   testClassicFilePath + "." + testTXTExtension,
+				data:   testIPs,
+				format: testTXTExtension,
+			},
+			want:      "",
+			wantError: fmt.Errorf("error creating file %v: %v", testClassicFilePath+"."+testTXTExtension, "error creating file"),
+		},
+		{
+			name: "UnsupportedFormat",
+			fields: fields{
+				mkdirAll: func(path string, perm os.FileMode) error {
+					return nil
+				},
+				create: func(name string) (io.Writer, error) {
+					return &bytes.Buffer{}, nil
+				},
+			},
+			args: args{
+				path:   testClassicFilePath + "." + testTXTExtension,
+				data:   testIPs,
+				format: "unsupported-format",
+			},
+			want:      "",
+			wantError: fmt.Errorf("unsupported format: %v", "unsupported-format"),
+		},
+		{
+			name: "WriteTXTSuccess",
+			fields: fields{
+				mkdirAll: func(path string, perm os.FileMode) error {
+					return nil
+				},
+				create: func(name string) (io.Writer, error) {
+					return &bytes.Buffer{}, nil
+				},
+			},
+			args: args{
+				path:   testClassicFilePath + "." + testTXTExtension,
+				data:   testIPs,
+				format: testTXTExtension,
+			},
+			want:      testIP1 + testIP2,
+			wantError: nil,
+		},
+		{
+			name: "WriteTXTError",
+			fields: fields{
+				mkdirAll: func(path string, perm os.FileMode) error {
+					return nil
+				},
+				create: func(name string) (io.Writer, error) {
+					return &mockWriter{
+						errWrite: errors.New(testErrorWriting),
+					}, nil
+				},
+			},
+			args: args{
+				path:   testClassicFilePath + "." + testTXTExtension,
+				data:   testIPs,
+				format: testTXTExtension,
+			},
+			want:      "",
+			wantError: fmt.Errorf("error writing TXT: %v", testErrorWriting),
+		},
+		{
+			name: "EncodeJSON",
+			fields: fields{
+				mkdirAll: func(path string, perm os.FileMode) error {
+					return nil
+				},
+				create: func(name string) (io.Writer, error) {
+					return &bytes.Buffer{}, nil
+				},
+			},
+			args: args{
+				path:   testClassicFilePath + "." + testJSONExtension,
+				data:   string(testProxiesToString),
+				format: testJSONExtension,
+			},
+			want:      string(testProxiesToString),
+			wantError: nil,
+		},
+		{
+			name: "EncodeJSONError",
+			fields: fields{
+				mkdirAll: func(path string, perm os.FileMode) error {
+					return nil
+				},
+				create: func(name string) (io.Writer, error) {
+					return &mockWriter{
+						errWrite: errors.New(testErrorWriting),
+					}, nil
+				},
+			},
+			args: args{
+				path:   testClassicFilePath + "." + testJSONExtension,
+				data:   testProxies,
+				format: testJSONExtension,
+			},
+			want:      "",
+			wantError: fmt.Errorf(testErrorEncode, "JSON", testErrorWriting),
+		},
+		{
+			name: "EncodeCSVWithStringData",
+			fields: fields{
+				mkdirAll: func(path string, perm os.FileMode) error {
+					return nil
+				},
+				create: func(name string) (io.Writer, error) {
+					return &bytes.Buffer{}, nil
+				},
+				csvWriter: &mockCSVWriterUtil{},
+			},
+			args: args{
+				path:   testClassicFilePath + "." + testCSVExtension,
+				data:   testIPs,
+				format: testCSVExtension,
+			},
+			want:      string(testIPsToString) + "\n",
+			wantError: nil,
+		},
+		{
+			name: "EncodeCSVWithProxyData",
+			fields: fields{
+				mkdirAll: func(path string, perm os.FileMode) error {
+					return nil
+				},
+				create: func(name string) (io.Writer, error) {
+					return &bytes.Buffer{}, nil
+				},
+				csvWriter: &mockCSVWriterUtil{},
+			},
+			args: args{
+				path:   testAdvancedFilePath + "." + testCSVExtension,
+				data:   testProxies,
+				format: testCSVExtension,
+			},
+			want:      string(testProxiesToString) + "\n",
+			wantError: nil,
+		},
+		{
+			name: "EncodeCSVWithAdvancedProxyData",
+			fields: fields{
+				mkdirAll: func(path string, perm os.FileMode) error {
+					return nil
+				},
+				create: func(name string) (io.Writer, error) {
+					return &bytes.Buffer{}, nil
+				},
+				csvWriter: &mockCSVWriterUtil{},
+			},
+			args: args{
+				path:   testAdvancedFilePath + "." + testCSVExtension,
+				data:   testAdvancedProxies,
+				format: testCSVExtension,
+			},
+			want:      string(testAdvancedProxiesToString) + "\n",
+			wantError: nil,
+		},
+		{
+			name: "EncodeCSVWithErrorDataType",
+			fields: fields{
+				mkdirAll: func(path string, perm os.FileMode) error {
+					return nil
+				},
+				create: func(name string) (io.Writer, error) {
+					return &bytes.Buffer{}, nil
+				},
+				csvWriter: &mockCSVWriterUtil{},
+			},
+			args: args{
+				path:   testClassicFilePath + "." + testCSVExtension,
+				data:   []error{},
+				format: testCSVExtension,
+			},
+			want:      "",
+			wantError: errors.New("invalid data type for CSV encoding"),
+		},
+		{
+			name: "EncodeXMLWithStringStruct",
+			fields: fields{
+				mkdirAll: func(path string, perm os.FileMode) error {
+					return nil
+				},
+				create: func(name string) (io.Writer, error) {
+					return &bytes.Buffer{}, nil
+				},
+			},
+			args: args{
+				path:   testClassicFilePath + "." + testXMLExtension,
+				data:   testIPs,
+				format: testXMLExtension,
+			},
+			want:      string(testIPsToString),
+			wantError: nil,
+		},
+		{
+			name: "EncodeXMLWithProxyStruct",
+			fields: fields{
+				mkdirAll: func(path string, perm os.FileMode) error {
+					return nil
+				},
+				create: func(name string) (io.Writer, error) {
+					return &bytes.Buffer{}, nil
+				},
+			},
+			args: args{
+				path:   testClassicFilePath + "." + testXMLExtension,
+				data:   testProxies,
+				format: testXMLExtension,
+			},
+			want:      string(testProxiesToString),
+			wantError: nil,
+		},
+		{
+			name: "EncodeXMLWithAdvancedProxyStruct",
+			fields: fields{
+				mkdirAll: func(path string, perm os.FileMode) error {
+					return nil
+				},
+				create: func(name string) (io.Writer, error) {
+					return &bytes.Buffer{}, nil
+				},
+			},
+			args: args{
+				path:   testClassicFilePath + "." + testXMLExtension,
+				data:   testAdvancedProxies,
+				format: testXMLExtension,
+			},
+			want:      string(testAdvancedProxiesToString),
+			wantError: nil,
+		},
+		{
+			name: "EncodeXMLError",
+			fields: fields{
+				mkdirAll: func(path string, perm os.FileMode) error {
+					return nil
+				},
+				create: func(name string) (io.Writer, error) {
+					return &mockWriter{
+						errWrite: errors.New(testErrorWriting),
+					}, nil
+				},
+			},
+			args: args{
+				path:   testClassicFilePath + "." + testXMLExtension,
+				data:   testProxies,
+				format: testXMLExtension,
+			},
+			want:      "",
+			wantError: fmt.Errorf(testErrorEncode, "XML", testErrorWriting),
+		},
+		{
+			name: "EncodeYAMLWithStringStruct",
+			fields: fields{
+				mkdirAll: func(path string, perm os.FileMode) error {
+					return nil
+				},
+				create: func(name string) (io.Writer, error) {
+					return &bytes.Buffer{}, nil
+				},
+			},
+			args: args{
+				path:   testClassicFilePath + "." + testYAMLExtension,
+				data:   testIPs,
+				format: testYAMLExtension,
+			},
+			want:      string(testIPsToString),
+			wantError: nil,
+		},
+		{
+			name: "EncodeYAMLWithProxyStruct",
+			fields: fields{
+				mkdirAll: func(path string, perm os.FileMode) error {
+					return nil
+				},
+				create: func(name string) (io.Writer, error) {
+					return &bytes.Buffer{}, nil
+				},
+			},
+			args: args{
+				path:   testClassicFilePath + "." + testYAMLExtension,
+				data:   testProxies,
+				format: testYAMLExtension,
+			},
+			want:      string(testProxiesToString),
+			wantError: nil,
+		},
+		{
+			name: "EncodeYAMLWithAdvancedProxyStruct",
+			fields: fields{
+				mkdirAll: func(path string, perm os.FileMode) error {
+					return nil
+				},
+				create: func(name string) (io.Writer, error) {
+					return &bytes.Buffer{}, nil
+				},
+			},
+			args: args{
+				path:   testClassicFilePath + "." + testYAMLExtension,
+				data:   testAdvancedProxies,
+				format: testYAMLExtension,
+			},
+			want:      string(testAdvancedProxiesToString),
+			wantError: nil,
+		},
+		{
+			name: "EncodeYAMLError",
+			fields: fields{
+				mkdirAll: func(path string, perm os.FileMode) error {
+					return nil
+				},
+				create: func(name string) (io.Writer, error) {
+					return &mockWriter{
+						errWrite: errors.New(testErrorWriting),
+					}, nil
+				},
+			},
+			args: args{
+				path:   testClassicFilePath + "." + testYAMLExtension,
+				data:   testProxies,
+				format: testYAMLExtension,
+			},
+			want:      "",
+			wantError: fmt.Errorf(testErrorEncode, "YAML", "yaml: write error: error writing"),
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			r := &repository.FileRepository{
+				MkdirAll:  tt.fields.mkdirAll,
+				Create:    tt.fields.create,
+				CSVWriter: tt.fields.csvWriter,
+			}
+			err := r.SaveFile(tt.args.path, tt.args.data, tt.args.format)
+			if (err != nil && tt.wantError != nil && err.Error() != tt.wantError.Error()) ||
+				(err == nil && tt.wantError != nil) ||
+				(err != nil && tt.wantError == nil) {
+				t.Errorf(expectedErrorButGotMessage, "SaveFile()", tt.wantError, err)
+			}
+		})
+	}
+}
+
+func TestWriteCSV(t *testing.T) {
+	type fields struct {
+		csvWriter utils.CSVWriterUtilInterface
+	}
+
+	type args struct {
+		header []string
+		rows   [][]string
+	}
+
+	tests := []struct {
+		name      string
+		fields    fields
+		args      args
+		wantError error
+	}{
+		{
+			name: "Success",
+			fields: fields{
+				csvWriter: &mockCSVWriterUtil{},
+			},
+			args: args{
+				header: []string{column1, column2},
+				rows: [][]string{
+					{row1Column1, row1Column2},
+					{row2Column1, row2Column2},
+				},
+			},
+			wantError: nil,
+		},
+		{
+			name: "ErrorWritingHeader",
+			fields: fields{
+				csvWriter: &mockCSVWriterUtil{
+					errWrite: errors.New("write header error"),
+				},
+			},
+			args: args{
+				header: []string{column1, column2},
+				rows: [][]string{
+					{row1Column1, row1Column2},
+					{row2Column1, row2Column2},
+				},
+			},
+			wantError: fmt.Errorf("failed to write header: %w", errors.New("write header error")),
+		},
+		{
+			name: "ErrorWritingRow",
+			fields: fields{
+				csvWriter: &mockCSVWriterUtil{
+					errWrite: errors.New("write row error"),
+				},
+			},
+			args: args{
+				header: nil,
+				rows: [][]string{
+					{row1Column1, row1Column2},
+					{row2Column1, row2Column2},
+				},
+			},
+			wantError: fmt.Errorf("failed to write row: %w", errors.New("write row error")),
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var buf bytes.Buffer
+			r := &repository.FileRepository{
+				CSVWriter: tt.fields.csvWriter,
+			}
+			err := r.WriteCSV(&buf, tt.args.header, tt.args.rows)
+			if (err != nil && tt.wantError != nil && err.Error() != tt.wantError.Error()) ||
+				(err == nil && tt.wantError != nil) ||
+				(err != nil && tt.wantError == nil) {
+				t.Errorf(expectedErrorButGotMessage, "WriteCSV()", tt.wantError, err)
+			}
+		})
+	}
+}
diff --git a/test/unit/internal/infrastructure/repository/proxy_repository_test.go b/test/unit/internal/infrastructure/repository/proxy_repository_test.go
new file mode 100644
index 00000000..51c07333
--- /dev/null
+++ b/test/unit/internal/infrastructure/repository/proxy_repository_test.go
@@ -0,0 +1,772 @@
+package repository_test
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/fyvri/fresh-proxy-list/internal/entity"
+	"github.com/fyvri/fresh-proxy-list/internal/infrastructure/repository"
+)
+
+func TestNewProxyRepository(t *testing.T) {
+	tests := []struct {
+		name string
+		want repository.ProxyRepositoryInterface
+	}{
+		{
+			name: "Success",
+			want: &repository.ProxyRepository{},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			proxyRepository := repository.NewProxyRepository()
+
+			if proxyRepository == nil {
+				t.Errorf(expectedReturnNonNil, "NewProxyRepository", "ProxyRepositoryInterface")
+			}
+
+			got, ok := proxyRepository.(*repository.ProxyRepository)
+			if !ok {
+				t.Errorf(expectedTypeAssertionErrorMessage, "*repository.ProxyRepository")
+			}
+
+			if !reflect.DeepEqual(tt.want, got) {
+				t.Errorf(expectedButGotMessage, "*repository.ProxyRepository", tt.want, got)
+			}
+		})
+	}
+}
+
+func TestProxyRepository(t *testing.T) {
+	type fields struct {
+		allClassicView     []string
+		httpClassicView    []string
+		httpsClassicView   []string
+		socks4ClassicView  []string
+		socks5ClassicView  []string
+		allAdvancedView    []entity.AdvancedProxy
+		httpAdvancedView   []entity.Proxy
+		httpsAdvancedView  []entity.Proxy
+		socks4AdvancedView []entity.Proxy
+		socks5AdvancedView []entity.Proxy
+	}
+
+	type args struct {
+		proxy entity.Proxy
+	}
+
+	tests := []struct {
+		name    string
+		fields  fields
+		args    args
+		want    fields
+		wantErr error
+	}{
+		{
+			name: "StoreHTTPProxy",
+			fields: fields{
+				allClassicView:     []string{},
+				httpClassicView:    []string{},
+				httpsClassicView:   []string{},
+				socks4ClassicView:  []string{},
+				socks5ClassicView:  []string{},
+				allAdvancedView:    []entity.AdvancedProxy{},
+				httpAdvancedView:   []entity.Proxy{},
+				httpsAdvancedView:  []entity.Proxy{},
+				socks4AdvancedView: []entity.Proxy{},
+				socks5AdvancedView: []entity.Proxy{},
+			},
+			args: args{
+				proxy: testProxyEntity1,
+			},
+			want: fields{
+				allClassicView: []string{
+					testProxy1,
+				},
+				httpClassicView: []string{
+					testProxy1,
+				},
+				httpsClassicView:  []string{},
+				socks4ClassicView: []string{},
+				socks5ClassicView: []string{},
+				allAdvancedView: []entity.AdvancedProxy{
+					testAdvancedProxyEntity1,
+				},
+				httpAdvancedView: []entity.Proxy{
+					testProxyEntity1,
+				},
+				httpsAdvancedView:  []entity.Proxy{},
+				socks4AdvancedView: []entity.Proxy{},
+				socks5AdvancedView: []entity.Proxy{},
+			},
+			wantErr: nil,
+		},
+		{
+			name: "StoreHTTPSProxy",
+			fields: fields{
+				allClassicView:     []string{},
+				httpClassicView:    []string{},
+				httpsClassicView:   []string{},
+				socks4ClassicView:  []string{},
+				socks5ClassicView:  []string{},
+				allAdvancedView:    []entity.AdvancedProxy{},
+				httpAdvancedView:   []entity.Proxy{},
+				httpsAdvancedView:  []entity.Proxy{},
+				socks4AdvancedView: []entity.Proxy{},
+				socks5AdvancedView: []entity.Proxy{},
+			},
+			args: args{
+				proxy: testProxyEntity2,
+			},
+			want: fields{
+				allClassicView: []string{
+					testProxy2,
+				},
+				httpClassicView: []string{},
+				httpsClassicView: []string{
+					testProxy2,
+				},
+				socks4ClassicView: []string{},
+				socks5ClassicView: []string{},
+				allAdvancedView: []entity.AdvancedProxy{
+					testAdvancedProxyEntity2,
+				},
+				httpAdvancedView: []entity.Proxy{},
+				httpsAdvancedView: []entity.Proxy{
+					testProxyEntity2,
+				},
+				socks4AdvancedView: []entity.Proxy{},
+				socks5AdvancedView: []entity.Proxy{},
+			},
+			wantErr: nil,
+		},
+		{
+			name: "StoreSOCKS4Proxy",
+			fields: fields{
+				allClassicView:     []string{},
+				httpClassicView:    []string{},
+				httpsClassicView:   []string{},
+				socks4ClassicView:  []string{},
+				socks5ClassicView:  []string{},
+				allAdvancedView:    []entity.AdvancedProxy{},
+				httpAdvancedView:   []entity.Proxy{},
+				httpsAdvancedView:  []entity.Proxy{},
+				socks4AdvancedView: []entity.Proxy{},
+				socks5AdvancedView: []entity.Proxy{},
+			},
+			args: args{
+				proxy: testProxyEntity3,
+			},
+			want: fields{
+				allClassicView: []string{
+					testProxy3,
+				},
+				httpClassicView:  []string{},
+				httpsClassicView: []string{},
+				socks4ClassicView: []string{
+					testProxy3,
+				},
+				socks5ClassicView: []string{},
+				allAdvancedView: []entity.AdvancedProxy{
+					testAdvancedProxyEntity3,
+				},
+				httpAdvancedView:  []entity.Proxy{},
+				httpsAdvancedView: []entity.Proxy{},
+				socks4AdvancedView: []entity.Proxy{
+					testProxyEntity3,
+				},
+				socks5AdvancedView: []entity.Proxy{},
+			},
+			wantErr: nil,
+		},
+		{
+			name: "StoreSOCKS5Proxy",
+			fields: fields{
+				allClassicView:     []string{},
+				httpClassicView:    []string{},
+				httpsClassicView:   []string{},
+				socks4ClassicView:  []string{},
+				socks5ClassicView:  []string{},
+				allAdvancedView:    []entity.AdvancedProxy{},
+				httpAdvancedView:   []entity.Proxy{},
+				httpsAdvancedView:  []entity.Proxy{},
+				socks4AdvancedView: []entity.Proxy{},
+				socks5AdvancedView: []entity.Proxy{},
+			},
+			args: args{
+				proxy: testProxyEntity4,
+			},
+			want: fields{
+				allClassicView: []string{
+					testProxy4,
+				},
+				httpClassicView:   []string{},
+				httpsClassicView:  []string{},
+				socks4ClassicView: []string{},
+				socks5ClassicView: []string{
+					testProxy4,
+				},
+				allAdvancedView: []entity.AdvancedProxy{
+					testAdvancedProxyEntity4,
+				},
+				httpAdvancedView:   []entity.Proxy{},
+				httpsAdvancedView:  []entity.Proxy{},
+				socks4AdvancedView: []entity.Proxy{},
+				socks5AdvancedView: []entity.Proxy{
+					testProxyEntity4,
+				},
+			},
+			wantErr: nil,
+		},
+		{
+			name: "DuplicatedProxyWithinHTTPCategoryAndDifferentCategory",
+			fields: fields{
+				allClassicView: []string{
+					testProxy3,
+					testProxy4,
+				},
+				httpClassicView:  []string{},
+				httpsClassicView: []string{},
+				socks4ClassicView: []string{
+					testProxy3,
+				},
+				socks5ClassicView: []string{
+					testProxy4,
+				},
+				allAdvancedView: []entity.AdvancedProxy{
+					testAdvancedProxyEntity3,
+					testAdvancedProxyEntity4,
+				},
+				httpAdvancedView:  []entity.Proxy{},
+				httpsAdvancedView: []entity.Proxy{},
+				socks4AdvancedView: []entity.Proxy{
+					testProxyEntity3,
+				},
+				socks5AdvancedView: []entity.Proxy{
+					testProxyEntity4,
+				},
+			},
+			args: args{
+				proxy: entity.Proxy{
+					Category:  testHTTPCategory,
+					IP:        testIP4,
+					Port:      testPort4,
+					Proxy:     testProxy4,
+					TimeTaken: testTimeTaken,
+					CheckedAt: testCheckedAt,
+				},
+			},
+			want: fields{
+				allClassicView: []string{
+					testProxy3,
+					testProxy4,
+				},
+				httpClassicView: []string{
+					testProxy4,
+				},
+				httpsClassicView: []string{},
+				socks4ClassicView: []string{
+					testProxy3,
+				},
+				socks5ClassicView: []string{
+					testProxy4,
+				},
+				allAdvancedView: []entity.AdvancedProxy{
+					testAdvancedProxyEntity3,
+					{
+						Proxy:     testAdvancedProxyEntity4.Proxy,
+						IP:        testAdvancedProxyEntity4.IP,
+						Port:      testAdvancedProxyEntity4.Port,
+						TimeTaken: testTimeTaken,
+						CheckedAt: testAdvancedProxyEntity4.CheckedAt,
+						Categories: []string{
+							testHTTPCategory,
+							testProxyEntity4.Category,
+						},
+					},
+				},
+				httpAdvancedView: []entity.Proxy{
+					{
+						Category:  testHTTPCategory,
+						IP:        testIP4,
+						Port:      testPort4,
+						Proxy:     testProxy4,
+						TimeTaken: testTimeTaken,
+						CheckedAt: testCheckedAt,
+					},
+				},
+				httpsAdvancedView: []entity.Proxy{},
+				socks4AdvancedView: []entity.Proxy{
+					testProxyEntity3,
+				},
+				socks5AdvancedView: []entity.Proxy{
+					testProxyEntity4,
+				},
+			},
+			wantErr: nil,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			r := &repository.ProxyRepository{
+				AllClassicView:     tt.fields.allClassicView,
+				HTTPClassicView:    tt.fields.httpClassicView,
+				HTTPSClassicView:   tt.fields.httpsClassicView,
+				SOCKS4ClassicView:  tt.fields.socks4ClassicView,
+				SOCKS5ClassicView:  tt.fields.socks5ClassicView,
+				AllAdvancedView:    tt.fields.allAdvancedView,
+				HTTPAdvancedView:   tt.fields.httpAdvancedView,
+				HTTPSAdvancedView:  tt.fields.httpsAdvancedView,
+				SOCKS4AdvancedView: tt.fields.socks4AdvancedView,
+				SOCKS5AdvancedView: tt.fields.socks5AdvancedView,
+			}
+			r.Store(&tt.args.proxy)
+
+			views := map[string]struct {
+				got  interface{}
+				want interface{}
+			}{
+				"GetAllClassicView()":     {r.AllClassicView, tt.want.allClassicView},
+				"GetHTTPClassicView()":    {r.HTTPClassicView, tt.want.httpClassicView},
+				"GetHTTPSClassicView()":   {r.HTTPSClassicView, tt.want.httpsClassicView},
+				"GetSOCKS4ClassicView()":  {r.SOCKS4ClassicView, tt.want.socks4ClassicView},
+				"GetSOCKS5ClassicView()":  {r.SOCKS5ClassicView, tt.want.socks5ClassicView},
+				"GetAllAdvancedView()":    {r.AllAdvancedView, tt.want.allAdvancedView},
+				"GetHTTPAdvancedView()":   {r.HTTPAdvancedView, tt.want.httpAdvancedView},
+				"GetHTTPSAdvancedView()":  {r.HTTPSAdvancedView, tt.want.httpsAdvancedView},
+				"GetSOCKS4AdvancedView()": {r.SOCKS4AdvancedView, tt.want.socks4AdvancedView},
+				"GetSOCKS5AdvancedView()": {r.SOCKS5AdvancedView, tt.want.socks5AdvancedView},
+			}
+			for name, v := range views {
+				if !reflect.DeepEqual(v.got, v.want) {
+					t.Errorf(expectedButGotMessage, name, v.want, v.got)
+				}
+			}
+		})
+	}
+}
+
+func TestGetAllClassicView(t *testing.T) {
+	tests := []struct {
+		name  string
+		setup func() *repository.ProxyRepository
+		want  []string
+	}{
+		{
+			name: "EmptyAllProxies",
+			setup: func() *repository.ProxyRepository {
+				return &repository.ProxyRepository{
+					AllClassicView: []string{},
+				}
+			},
+			want: []string{},
+		},
+		{
+			name: "WithAllProxies",
+			setup: func() *repository.ProxyRepository {
+				r := &repository.ProxyRepository{}
+				r.AllClassicView = []string{
+					testProxy1,
+					testProxy2,
+					testProxy3,
+					testProxy4,
+				}
+				return r
+			},
+			want: []string{
+				testProxy1,
+				testProxy2,
+				testProxy3,
+				testProxy4,
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			r := tt.setup()
+			got := r.GetAllClassicView()
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf(expectedButGotMessage, "GetAllClassicView()", tt.want, got)
+			}
+		})
+	}
+}
+
+func TestGetHTTPClassicView(t *testing.T) {
+	tests := []struct {
+		name  string
+		setup func() *repository.ProxyRepository
+		want  []string
+	}{
+		{
+			name: "EmptyHTTPProxies",
+			setup: func() *repository.ProxyRepository {
+				return &repository.ProxyRepository{
+					HTTPClassicView: []string{},
+				}
+			},
+			want: []string{},
+		},
+		{
+			name: "WithHTTPProxies",
+			setup: func() *repository.ProxyRepository {
+				r := &repository.ProxyRepository{}
+				r.HTTPClassicView = []string{
+					testProxy1,
+				}
+				return r
+			},
+			want: []string{
+				testProxy1,
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			r := tt.setup()
+			got := r.GetHTTPClassicView()
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf(expectedButGotMessage, "GetHTTPClassicView()", tt.want, got)
+			}
+		})
+	}
+}
+
+func TestGetHTTPSClassicView(t *testing.T) {
+	tests := []struct {
+		name  string
+		setup func() *repository.ProxyRepository
+		want  []string
+	}{
+		{
+			name: "EmptyHTTPSProxies",
+			setup: func() *repository.ProxyRepository {
+				return &repository.ProxyRepository{
+					HTTPSClassicView: []string{},
+				}
+			},
+			want: []string{},
+		},
+		{
+			name: "WithHTTPSProxies",
+			setup: func() *repository.ProxyRepository {
+				r := &repository.ProxyRepository{}
+				r.HTTPSClassicView = []string{
+					testProxy2,
+				}
+				return r
+			},
+			want: []string{
+				testProxy2,
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			r := tt.setup()
+			got := r.GetHTTPSClassicView()
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf(expectedButGotMessage, "GetHTTPSClassicView()", tt.want, got)
+			}
+		})
+	}
+}
+
+func TestGetSOCKS4ClassicView(t *testing.T) {
+	tests := []struct {
+		name  string
+		setup func() *repository.ProxyRepository
+		want  []string
+	}{
+		{
+			name: "EmptySOCKS4Proxies",
+			setup: func() *repository.ProxyRepository {
+				r := &repository.ProxyRepository{}
+				r.SOCKS4ClassicView = []string{}
+				return r
+			},
+			want: []string{},
+		},
+		{
+			name: "WithSOCKS4Proxies",
+			setup: func() *repository.ProxyRepository {
+				return &repository.ProxyRepository{
+					SOCKS4ClassicView: []string{
+						testProxy3,
+					},
+				}
+			},
+			want: []string{
+				testProxy3,
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			r := tt.setup()
+			got := r.GetSOCKS4ClassicView()
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf(expectedButGotMessage, "GetSOCKS4ClassicView()", tt.want, got)
+			}
+		})
+	}
+}
+
+func TestGetSOCKS5ClassicView(t *testing.T) {
+	tests := []struct {
+		name  string
+		setup func() *repository.ProxyRepository
+		want  []string
+	}{
+		{
+			name: "EmptySOCKS5Proxies",
+			setup: func() *repository.ProxyRepository {
+				return &repository.ProxyRepository{
+					SOCKS5ClassicView: []string{},
+				}
+			},
+			want: []string{},
+		},
+		{
+			name: "WithSOCKS5Proxies",
+			setup: func() *repository.ProxyRepository {
+				r := &repository.ProxyRepository{}
+				r.SOCKS5ClassicView = []string{
+					testProxy4,
+				}
+				return r
+			},
+			want: []string{
+				testProxy4,
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			r := tt.setup()
+			got := r.GetSOCKS5ClassicView()
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf(expectedButGotMessage, "GetSOCKS5ClassicView()", tt.want, got)
+			}
+		})
+	}
+}
+
+func TestGetAllAdvancedView(t *testing.T) {
+	tests := []struct {
+		name  string
+		setup func() *repository.ProxyRepository
+		want  []entity.AdvancedProxy
+	}{
+		{
+			name: "EmptyAllProxies",
+			setup: func() *repository.ProxyRepository {
+				return &repository.ProxyRepository{
+					AllAdvancedView: []entity.AdvancedProxy{},
+				}
+			},
+			want: []entity.AdvancedProxy{},
+		},
+		{
+			name: "WithAllProxies",
+			setup: func() *repository.ProxyRepository {
+				r := &repository.ProxyRepository{}
+				r.AllAdvancedView = []entity.AdvancedProxy{
+					testAdvancedProxyEntity1,
+					testAdvancedProxyEntity2,
+					testAdvancedProxyEntity3,
+					testAdvancedProxyEntity4,
+				}
+				return r
+			},
+			want: []entity.AdvancedProxy{
+				testAdvancedProxyEntity1,
+				testAdvancedProxyEntity2,
+				testAdvancedProxyEntity3,
+				testAdvancedProxyEntity4,
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			r := tt.setup()
+			got := r.GetAllAdvancedView()
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf(expectedButGotMessage, "GetAllAdvancedView()", tt.want, got)
+			}
+		})
+	}
+}
+
+func TestGetHTTPAdvancedView(t *testing.T) {
+	tests := []struct {
+		name  string
+		setup func() *repository.ProxyRepository
+		want  []entity.Proxy
+	}{
+		{
+			name: "EmptyHTTPProxies",
+			setup: func() *repository.ProxyRepository {
+				return &repository.ProxyRepository{
+					HTTPAdvancedView: []entity.Proxy{},
+				}
+			},
+			want: []entity.Proxy{},
+		},
+		{
+			name: "WithHTTPProxies",
+			setup: func() *repository.ProxyRepository {
+				r := &repository.ProxyRepository{}
+				r.HTTPAdvancedView = []entity.Proxy{
+					testProxyEntity1,
+				}
+				return r
+			},
+			want: []entity.Proxy{
+				testProxyEntity1,
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			r := tt.setup()
+			got := r.GetHTTPAdvancedView()
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf(expectedButGotMessage, "GetHTTPAdvancedView()", tt.want, got)
+			}
+		})
+	}
+}
+
+func TestGetHTTPSAdvancedView(t *testing.T) {
+	tests := []struct {
+		name  string
+		setup func() *repository.ProxyRepository
+		want  []entity.Proxy
+	}{
+		{
+			name: "EmptyHTTPSProxies",
+			setup: func() *repository.ProxyRepository {
+				return &repository.ProxyRepository{
+					HTTPSAdvancedView: []entity.Proxy{},
+				}
+			},
+			want: []entity.Proxy{},
+		},
+		{
+			name: "WithHTTPSProxies",
+			setup: func() *repository.ProxyRepository {
+				r := &repository.ProxyRepository{}
+				r.HTTPSAdvancedView = []entity.Proxy{
+					testProxyEntity2,
+				}
+				return r
+			},
+			want: []entity.Proxy{
+				testProxyEntity2,
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			r := tt.setup()
+			got := r.GetHTTPSAdvancedView()
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf(expectedButGotMessage, "GetHTTPSAdvancedView()", tt.want, got)
+			}
+		})
+	}
+}
+
+func TestGetSOCKS4AdvancedView(t *testing.T) {
+	tests := []struct {
+		name  string
+		setup func() *repository.ProxyRepository
+		want  []entity.Proxy
+	}{
+		{
+			name: "EmptySOCKS4Proxies",
+			setup: func() *repository.ProxyRepository {
+				return &repository.ProxyRepository{
+					SOCKS4AdvancedView: []entity.Proxy{},
+				}
+			},
+			want: []entity.Proxy{},
+		},
+		{
+			name: "WithSOCKSProxies",
+			setup: func() *repository.ProxyRepository {
+				r := &repository.ProxyRepository{}
+				r.SOCKS4AdvancedView = []entity.Proxy{
+					testProxyEntity3,
+				}
+				return r
+			},
+			want: []entity.Proxy{
+				testProxyEntity3,
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			r := tt.setup()
+			got := r.GetSOCKS4AdvancedView()
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf(expectedButGotMessage, "GetSOCKS4AdvancedView()", tt.want, got)
+			}
+		})
+	}
+}
+
+func TestGetSOCKS5AdvancedView(t *testing.T) {
+	tests := []struct {
+		name  string
+		setup func() *repository.ProxyRepository
+		want  []entity.Proxy
+	}{
+		{
+			name: "EmptySOCKS5Proxies",
+			setup: func() *repository.ProxyRepository {
+				return &repository.ProxyRepository{
+					SOCKS5AdvancedView: []entity.Proxy{},
+				}
+			},
+			want: []entity.Proxy{},
+		},
+		{
+			name: "WithSOCKS5Proxies",
+			setup: func() *repository.ProxyRepository {
+				r := &repository.ProxyRepository{}
+				r.SOCKS5AdvancedView = []entity.Proxy{
+					testProxyEntity4,
+				}
+				return r
+			},
+			want: []entity.Proxy{
+				testProxyEntity4,
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			r := tt.setup()
+			got := r.GetSOCKS5AdvancedView()
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf(expectedButGotMessage, "GetSOCKS5AdvancedView()", tt.want, got)
+			}
+		})
+	}
+}
diff --git a/test/unit/internal/infrastructure/repository/repository_test.go b/test/unit/internal/infrastructure/repository/repository_test.go
new file mode 100644
index 00000000..4d1f79c9
--- /dev/null
+++ b/test/unit/internal/infrastructure/repository/repository_test.go
@@ -0,0 +1,190 @@
+package repository_test
+
+import (
+	"encoding/csv"
+	"encoding/json"
+	"io"
+	"time"
+
+	"github.com/fyvri/fresh-proxy-list/internal/entity"
+)
+
+var (
+	expectedButGotMessage             = "Expected %v = %v, but got = %v"
+	expectedErrorButGotMessage        = "Expected %v error = %v, but got = %v"
+	expectedTypeAssertionErrorMessage = "Expected type assertion error, but got = %v"
+	expectedReturnNonNil              = "Expected %v to return a non-nil %v"
+	testErrorWriting                  = "error writing"
+	testErrorEncode                   = "error encoding %s: %s"
+	testStorageDir                    = "/tmp"
+	testClassicDir                    = "/classic"
+	testAdvancedDir                   = "/advanced"
+	testClassicFilePath               = testStorageDir + testClassicDir + "/test_file"
+	testAdvancedFilePath              = testStorageDir + testAdvancedDir + "/test_file"
+	testTXTExtension                  = "txt"
+	testCSVExtension                  = "csv"
+	testJSONExtension                 = "json"
+	testXMLExtension                  = "xml"
+	testYAMLExtension                 = "yaml"
+	testHTTPCategory                  = "HTTP"
+	testHTTPSCategory                 = "HTTPS"
+	testSOCKS4Category                = "SOCKS4"
+	testSOCKS5Category                = "SOCKS5"
+	testTimeTaken                     = 1.2345
+	testCheckedAt                     = "2024-07-27T00:00:00Z"
+
+	testIP1          = "13.37.0.1"
+	testPort1        = "1337"
+	testProxy1       = testIP1 + ":" + testPort1
+	testCategory1    = testHTTPCategory
+	testProxyEntity1 = entity.Proxy{
+		Proxy:     testProxy1,
+		IP:        testIP1,
+		Port:      testPort1,
+		Category:  testCategory1,
+		TimeTaken: 0,
+		CheckedAt: time.Now().Format(time.RFC3339),
+	}
+	testAdvancedProxyEntity1 = entity.AdvancedProxy{
+		Proxy:     testProxyEntity1.Proxy,
+		IP:        testProxyEntity1.IP,
+		Port:      testProxyEntity1.Port,
+		TimeTaken: testProxyEntity1.TimeTaken,
+		CheckedAt: testProxyEntity1.CheckedAt,
+		Categories: []string{
+			testCategory1,
+		},
+	}
+
+	testIP2          = "13.37.0.2"
+	testPort2        = "1337"
+	testProxy2       = testIP2 + ":" + testPort2
+	testCategory2    = testHTTPSCategory
+	testProxyEntity2 = entity.Proxy{
+		Proxy:     testProxy2,
+		IP:        testIP2,
+		Port:      testPort2,
+		Category:  testCategory2,
+		TimeTaken: 0,
+		CheckedAt: time.Now().Format(time.RFC3339),
+	}
+	testAdvancedProxyEntity2 = entity.AdvancedProxy{
+		Proxy:     testProxyEntity2.Proxy,
+		IP:        testProxyEntity2.IP,
+		Port:      testProxyEntity2.Port,
+		TimeTaken: testProxyEntity2.TimeTaken,
+		CheckedAt: testProxyEntity2.CheckedAt,
+		Categories: []string{
+			testCategory2,
+		},
+	}
+
+	testIP3          = "13.37.0.3"
+	testPort3        = "1337"
+	testProxy3       = testIP3 + ":" + testPort3
+	testCategory3    = testSOCKS4Category
+	testProxyEntity3 = entity.Proxy{
+		Proxy:     testProxy3,
+		IP:        testIP3,
+		Port:      testPort3,
+		Category:  testCategory3,
+		TimeTaken: 0,
+		CheckedAt: time.Now().Format(time.RFC3339),
+	}
+	testAdvancedProxyEntity3 = entity.AdvancedProxy{
+		Proxy:     testProxyEntity3.Proxy,
+		IP:        testProxyEntity3.IP,
+		Port:      testProxyEntity3.Port,
+		TimeTaken: testProxyEntity3.TimeTaken,
+		CheckedAt: testProxyEntity3.CheckedAt,
+		Categories: []string{
+			testCategory3,
+		},
+	}
+
+	testIP4          = "13.37.0.4"
+	testPort4        = "1337"
+	testProxy4       = testIP4 + ":" + testPort4
+	testCategory4    = testSOCKS5Category
+	testProxyEntity4 = entity.Proxy{
+		Proxy:     testProxy4,
+		IP:        testIP4,
+		Port:      testPort4,
+		Category:  testCategory4,
+		TimeTaken: 0,
+		CheckedAt: time.Now().Format(time.RFC3339),
+	}
+	testAdvancedProxyEntity4 = entity.AdvancedProxy{
+		Proxy:     testProxyEntity4.Proxy,
+		IP:        testProxyEntity4.IP,
+		Port:      testProxyEntity4.Port,
+		TimeTaken: testProxyEntity4.TimeTaken,
+		CheckedAt: testProxyEntity4.CheckedAt,
+		Categories: []string{
+			testCategory4,
+		},
+	}
+
+	testIPs = []string{
+		testIP1,
+		testIP2,
+		testIP3,
+		testIP4,
+	}
+	testProxies = []entity.Proxy{
+		testProxyEntity1,
+		testProxyEntity2,
+		testProxyEntity3,
+		testProxyEntity4,
+	}
+	testAdvancedProxies = []entity.AdvancedProxy{
+		testAdvancedProxyEntity1,
+		testAdvancedProxyEntity2,
+		testAdvancedProxyEntity3,
+		testAdvancedProxyEntity4,
+	}
+	testIPsToString, _             = json.Marshal(testIPs)
+	testProxiesToString, _         = json.Marshal(testProxies)
+	testAdvancedProxiesToString, _ = json.Marshal(testAdvancedProxies)
+)
+
+type mockWriter struct {
+	errWrite error
+	errClose error
+}
+
+func (m *mockWriter) Write(p []byte) (int, error) {
+	if m.errWrite != nil {
+		return 0, m.errWrite
+	}
+	return len(p), nil
+}
+
+func (m *mockWriter) Close() error {
+	if m.errClose != nil {
+		return m.errClose
+	}
+	return nil
+}
+
+type mockCSVWriterUtil struct {
+	errFlush error
+	errWrite error
+}
+
+func (m *mockCSVWriterUtil) Init(w io.Writer) *csv.Writer {
+	return csv.NewWriter(w)
+}
+
+func (m *mockCSVWriterUtil) Flush(csvWriter *csv.Writer) {
+	if m.errFlush != nil {
+		return
+	}
+}
+
+func (m *mockCSVWriterUtil) Write(csvWriter *csv.Writer, record []string) error {
+	if m.errWrite != nil {
+		return m.errWrite
+	}
+	return nil
+}
diff --git a/test/unit/internal/infrastructure/repository/source_repository_test.go b/test/unit/internal/infrastructure/repository/source_repository_test.go
new file mode 100644
index 00000000..f8e9afa0
--- /dev/null
+++ b/test/unit/internal/infrastructure/repository/source_repository_test.go
@@ -0,0 +1,113 @@
+package repository_test
+
+import (
+	"errors"
+	"reflect"
+	"testing"
+
+	"github.com/fyvri/fresh-proxy-list/internal/entity"
+	"github.com/fyvri/fresh-proxy-list/internal/infrastructure/repository"
+)
+
+func TestNewSourceRepository(t *testing.T) {
+	type args struct {
+		proxy_resources string
+	}
+
+	tests := []struct {
+		name string
+		args args
+		want repository.SourceRepositoryInterface
+	}{
+		{
+			name: "Success",
+			args: args{
+				proxy_resources: "",
+			},
+			want: &repository.SourceRepository{},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			sourceRepository := repository.NewSourceRepository(tt.args.proxy_resources)
+
+			if sourceRepository == nil {
+				t.Errorf(expectedReturnNonNil, "NewSourceRepository", "SourceRepositoryInterface")
+			}
+
+			got, ok := sourceRepository.(*repository.SourceRepository)
+			if !ok {
+				t.Errorf(expectedTypeAssertionErrorMessage, "*repository.SourceRepository")
+			}
+
+			if !reflect.DeepEqual(tt.want, got) {
+				t.Errorf(expectedButGotMessage, "*repository.SourceRepository", tt.want, got)
+			}
+		})
+	}
+}
+
+func TestLoadSources(t *testing.T) {
+	type args struct {
+		proxy_resources string
+	}
+
+	tests := []struct {
+		name    string
+		args    args
+		want    []entity.Source
+		wantErr error
+	}{
+		{
+			name: "EmptyResources",
+			args: args{
+				proxy_resources: "",
+			},
+			want:    nil,
+			wantErr: errors.New("PROXY_RESOURCES not found on environment"),
+		},
+		{
+			name: "InvalidJSON",
+			args: args{
+				proxy_resources: `{"invalid": "json"`,
+			},
+			want:    nil,
+			wantErr: errors.New("error parsing JSON: unexpected end of JSON input"),
+		},
+		{
+			name: "ValidJSON",
+			args: args{
+				proxy_resources: `[{"method": "GET", "category": "general", "url": "http://example.com", "is_checked": true}]`,
+			},
+			want: []entity.Source{
+				{
+					Method:    "GET",
+					Category:  "general",
+					URL:       "http://example.com",
+					IsChecked: true,
+				},
+			},
+			wantErr: nil,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			r := &repository.SourceRepository{
+				ProxyResources: tt.args.proxy_resources,
+			}
+			got, err := r.LoadSources()
+
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf(expectedButGotMessage, "LoadSources()", tt.want, got)
+			}
+
+			if (err != nil && tt.wantErr != nil && err.Error() != tt.wantErr.Error()) ||
+				(err != nil && tt.wantErr == nil) ||
+				(err == nil && tt.wantErr != nil) {
+				t.Errorf(expectedErrorButGotMessage, "LoadSources()", tt.wantErr, err)
+			}
+		})
+	}
+}
diff --git a/test/unit/internal/service/proxy_service_test.go b/test/unit/internal/service/proxy_service_test.go
new file mode 100644
index 00000000..815631b2
--- /dev/null
+++ b/test/unit/internal/service/proxy_service_test.go
@@ -0,0 +1,335 @@
+package service_test
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"reflect"
+	"testing"
+	"time"
+
+	"github.com/fyvri/fresh-proxy-list/internal/entity"
+	"github.com/fyvri/fresh-proxy-list/internal/service"
+	"github.com/fyvri/fresh-proxy-list/pkg/utils"
+)
+
+var (
+	expectedButGotMessage             = "Expected %v = %v, but got = %v"
+	expectedErrorButGotMessage        = "Expected %v error = %v, but got = %v"
+	expectedNonEmptyMessage           = "Expected non-empty %v from %v"
+	expectedReturnNonNil              = "Expected %v to return a non-nil %v"
+	expectedTypeAssertionErrorMessage = "Expected type assertion error, but got = %v"
+	testIP                            = "13.37.0.1"
+	testPort                          = "8080"
+	testProxy                         = testIP + ":" + testPort
+	testHTTPCategory                  = "HTTP"
+	testHTTPSCategory                 = "HTTPS"
+	testSOCKS4Category                = "SOCKS4"
+	testHTTPTestingSites              = []string{"http://test1.com", "http://test2.com"}
+	testHTTPSTestingSites             = []string{"https://secure1.com", "https://secure2.com"}
+	testUserAgents                    = []string{"Mozilla", "Chrome", "Safari"}
+)
+
+type mockURLParserUtil struct {
+	ParseFunc func(urlStr string) (*url.URL, error)
+}
+
+func (m *mockURLParserUtil) Parse(urlStr string) (*url.URL, error) {
+	if m.ParseFunc != nil {
+		return m.ParseFunc(urlStr)
+	}
+	return url.Parse(urlStr)
+}
+
+type mockFetcherUtil struct {
+	fetchDataByte  []byte
+	fetcherError   error
+	NewRequestFunc func(method, url string, body io.Reader) (*http.Request, error)
+	DoFunc         func(client *http.Client, req *http.Request) (*http.Response, error)
+}
+
+func (m *mockFetcherUtil) FetchData(url string) ([]byte, error) {
+	if m.fetcherError != nil {
+		return nil, m.fetcherError
+	}
+	return m.fetchDataByte, nil
+}
+
+func (m *mockFetcherUtil) Do(client *http.Client, req *http.Request) (*http.Response, error) {
+	if m.DoFunc != nil {
+		return m.DoFunc(client, req)
+	}
+	return httptest.NewRecorder().Result(), nil
+}
+
+func (m *mockFetcherUtil) NewRequest(method string, url string, body io.Reader) (*http.Request, error) {
+	if m.NewRequestFunc != nil {
+		return m.NewRequestFunc(method, url, body)
+	}
+	return http.NewRequest(method, url, body)
+}
+
+func TestNewProxyService(t *testing.T) {
+	proxyService := service.NewProxyService(&mockFetcherUtil{}, &mockURLParserUtil{}, testHTTPTestingSites, testHTTPSTestingSites, testUserAgents)
+	if proxyService == nil {
+		t.Errorf(expectedReturnNonNil, "NewProxyService", "ProxyServiceInterface")
+	}
+
+	s, ok := proxyService.(*service.ProxyService)
+	if !ok {
+		t.Errorf(expectedTypeAssertionErrorMessage, "*service.ProxyService")
+	}
+
+	if !reflect.DeepEqual(s.HTTPTestingSites, testHTTPTestingSites) {
+		t.Errorf(expectedButGotMessage, "HTTPTestingSites", testHTTPTestingSites, s.HTTPTestingSites)
+	}
+
+	if !reflect.DeepEqual(s.HTTPSTestingSites, testHTTPSTestingSites) {
+		t.Errorf(expectedButGotMessage, "HTTPSTestingSites", testHTTPSTestingSites, s.HTTPSTestingSites)
+	}
+
+	if !reflect.DeepEqual(s.UserAgents, testUserAgents) {
+		t.Errorf(expectedButGotMessage, "UserAgents", testUserAgents, s.UserAgents)
+	}
+}
+
+func TestCheck(t *testing.T) {
+	type fields struct {
+		fetcherUtil   utils.FetcherUtilInterface
+		urlParserUtil utils.URLParserUtilInterface
+	}
+
+	type args struct {
+		category string
+		ip       string
+		port     string
+	}
+
+	tests := []struct {
+		name      string
+		fields    fields
+		args      args
+		want      *entity.Proxy
+		wantError error
+	}{
+		{
+			name: "TestValid",
+			fields: fields{
+				fetcherUtil:   &mockFetcherUtil{},
+				urlParserUtil: &mockURLParserUtil{},
+			},
+			args: args{
+				category: testHTTPSCategory,
+				ip:       testIP,
+				port:     testPort,
+			},
+			want: &entity.Proxy{
+				Category:  testHTTPSCategory,
+				Proxy:     testProxy,
+				IP:        testIP,
+				Port:      testPort,
+				TimeTaken: 123.45,
+				CheckedAt: time.Now().Format(time.RFC3339),
+			},
+			wantError: nil,
+		},
+		{
+			name: "TestErrorParseURL",
+			fields: fields{
+				fetcherUtil: &mockFetcherUtil{},
+				urlParserUtil: &mockURLParserUtil{
+					ParseFunc: func(urlStr string) (*url.URL, error) {
+						return nil, errors.New("parse error")
+					},
+				},
+			},
+			args: args{
+				category: testHTTPCategory,
+				ip:       testIP,
+				port:     testPort,
+			},
+			want:      nil,
+			wantError: errors.New("error parsing proxy URL: parse error"),
+		},
+		{
+			name: "TestCreatingRequest",
+			fields: fields{
+				fetcherUtil: &mockFetcherUtil{
+					NewRequestFunc: func(method, url string, body io.Reader) (*http.Request, error) {
+						return nil, errors.New("error creating request")
+					},
+				},
+			},
+			args: args{
+				category: testSOCKS4Category,
+				ip:       testIP,
+				port:     testPort,
+			},
+			want:      nil,
+			wantError: errors.New("error creating request: error creating request"),
+		},
+		{
+			name:   "TestUnsupportedProxyCategory",
+			fields: fields{},
+			args: args{
+				category: "FTP",
+				ip:       testIP,
+				port:     testPort,
+			},
+			want:      nil,
+			wantError: errors.New("proxy category FTP not supported"),
+		},
+		{
+			name: "TestRequestError",
+			fields: fields{
+				fetcherUtil: &mockFetcherUtil{
+					DoFunc: func(client *http.Client, req *http.Request) (*http.Response, error) {
+						return nil, fmt.Errorf("network error")
+					},
+				},
+				urlParserUtil: &mockURLParserUtil{},
+			},
+			args: args{
+				category: testHTTPCategory,
+				ip:       testIP,
+				port:     testPort,
+			},
+			want:      nil,
+			wantError: errors.New("request error: network error"),
+		},
+		{
+			name: "TestUnexpectedStatusCode",
+			fields: fields{
+				fetcherUtil: &mockFetcherUtil{
+					DoFunc: func(client *http.Client, req *http.Request) (*http.Response, error) {
+						return &http.Response{
+							StatusCode: http.StatusInternalServerError,
+							Body:       http.NoBody,
+						}, nil
+					},
+				},
+				urlParserUtil: &mockURLParserUtil{},
+			},
+			args: args{
+				category: testHTTPCategory,
+				ip:       testIP,
+				port:     testPort,
+			},
+			want:      nil,
+			wantError: errors.New("unexpected status code 500: Internal Server Error"),
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			s := &service.ProxyService{
+				FetcherUtil:       tt.fields.fetcherUtil,
+				URLParserUtil:     tt.fields.urlParserUtil,
+				HTTPTestingSites:  testHTTPTestingSites,
+				HTTPSTestingSites: testHTTPSTestingSites,
+				UserAgents:        testUserAgents,
+				Semaphore:         make(chan struct{}, 10),
+			}
+			got, err := s.Check(tt.args.category, tt.args.ip, tt.args.port)
+
+			if (err != nil && tt.wantError != nil && err.Error() != tt.wantError.Error()) ||
+				(err == nil && tt.wantError != nil) ||
+				(err != nil && tt.wantError == nil) {
+				t.Errorf(expectedErrorButGotMessage, "ProxyService.Check()", tt.wantError, err)
+			}
+
+			if tt.want != nil &&
+				(!reflect.DeepEqual(got.Category, tt.want.Category) ||
+					!reflect.DeepEqual(got.Proxy, tt.want.Proxy) ||
+					!reflect.DeepEqual(got.IP, tt.want.IP) ||
+					!reflect.DeepEqual(got.Port, tt.want.Port)) {
+				t.Errorf(expectedButGotMessage, "ProxyService.Check()", tt.want, got)
+			}
+		})
+	}
+}
+
+func TestGetTestingSite(t *testing.T) {
+	type fields struct {
+		httpTestingSites  []string
+		httpsTestingSites []string
+	}
+
+	tests := []struct {
+		name   string
+		fields fields
+		want   []string
+	}{
+		{
+			name: "HTTP",
+			fields: fields{
+				httpTestingSites: testHTTPTestingSites,
+			},
+			want: testHTTPTestingSites,
+		},
+		{
+			name: "HTTPS",
+			fields: fields{
+				httpsTestingSites: testHTTPSTestingSites,
+			},
+			want: testHTTPSTestingSites,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			s := &service.ProxyService{
+				HTTPTestingSites:  tt.fields.httpTestingSites,
+				HTTPSTestingSites: tt.fields.httpsTestingSites,
+			}
+
+			site := s.GetTestingSite(tt.name)
+			if len(site) == 0 {
+				t.Errorf(expectedNonEmptyMessage, "site", tt.name+" sites")
+			}
+
+			found := false
+			for _, expectedSite := range tt.want {
+				if expectedSite == site {
+					found = true
+					break
+				}
+			}
+			if !found {
+				t.Errorf(expectedButGotMessage, "site", tt.want, site)
+			}
+		})
+	}
+}
+
+func TestGetRandomUserAgent(t *testing.T) {
+	tests := []struct {
+		name string
+	}{
+		{
+			name: "RandomUserAgent",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			s := &service.ProxyService{
+				UserAgents: testUserAgents,
+			}
+			site := s.GetRandomUserAgent()
+			found := false
+			for _, ua := range s.UserAgents {
+				if ua == site {
+					found = true
+					break
+				}
+			}
+			if !found {
+				t.Errorf(expectedButGotMessage, "user agent", s.UserAgents, site)
+			}
+		})
+	}
+}
diff --git a/test/unit/internal/usecase/file_usecase_test.go b/test/unit/internal/usecase/file_usecase_test.go
new file mode 100644
index 00000000..b416d831
--- /dev/null
+++ b/test/unit/internal/usecase/file_usecase_test.go
@@ -0,0 +1,104 @@
+package usecase_test
+
+import (
+	"path/filepath"
+	"strings"
+	"sync"
+	"testing"
+
+	"github.com/fyvri/fresh-proxy-list/internal/entity"
+	"github.com/fyvri/fresh-proxy-list/internal/usecase"
+)
+
+var (
+	mutex sync.Mutex
+)
+
+func TestSaveFiles(t *testing.T) {
+	mockFileRepository := &mockFileRepository{}
+	mockProxyRepository := &mockProxyRepository{}
+
+	mockProxyRepository.GetAllClassicViewFunc = func() []string {
+		return []string{
+			testProxy1,
+			testProxy2,
+			testProxy3,
+			testProxy4,
+		}
+	}
+	mockProxyRepository.GetAllAdvancedViewFunc = func() []entity.AdvancedProxy {
+		return []entity.AdvancedProxy{
+			testAdvancedProxyEntity1,
+			testAdvancedProxyEntity2,
+			testAdvancedProxyEntity3,
+			testAdvancedProxyEntity4,
+		}
+	}
+
+	mockProxyRepository.GetHTTPClassicViewFunc = func() []string {
+		return []string{testProxy1}
+	}
+	mockProxyRepository.GetHTTPAdvancedViewFunc = func() []entity.Proxy {
+		return []entity.Proxy{
+			testProxyEntity1,
+		}
+	}
+
+	mockProxyRepository.GetHTTPSClassicViewFunc = func() []string {
+		return []string{
+			testProxy2,
+		}
+	}
+	mockProxyRepository.GetHTTPSAdvancedViewFunc = func() []entity.Proxy {
+		return []entity.Proxy{
+			testProxyEntity2,
+		}
+	}
+
+	mockProxyRepository.GetSOCKS4ClassicViewFunc = func() []string {
+		return []string{
+			testProxy3,
+		}
+	}
+	mockProxyRepository.GetSOCKS4AdvancedViewFunc = func() []entity.Proxy {
+		return []entity.Proxy{
+			testProxyEntity3,
+		}
+	}
+
+	mockProxyRepository.GetSOCKS5ClassicViewFunc = func() []string {
+		return []string{
+			testProxy4,
+		}
+	}
+	mockProxyRepository.GetSOCKS5AdvancedViewFunc = func() []entity.Proxy {
+		return []entity.Proxy{
+			testProxyEntity4,
+		}
+	}
+
+	got := 0
+	mockFileRepository.SaveFileFunc = func(filename string, data interface{}, extension string) error {
+		mutex.Lock()
+		defer mutex.Unlock()
+
+		got++
+		t.Logf("SaveFile called with filename: %s, extension: %s", filename, extension)
+		if !strings.HasPrefix(filename, filepath.Join(testStorageDir, testClassicDir)) &&
+			!strings.HasPrefix(filename, filepath.Join(testStorageDir, testAdvancedDir)) {
+			t.Errorf(unexpectedMessage, "filename", filename)
+		}
+		if extension != testCSVExtension && extension != testJSONExtension && extension != testXMLExtension && extension != testYAMLExtension && extension != testTXTExtension {
+			t.Errorf(unexpectedMessage, "extension", extension)
+		}
+		return nil
+	}
+	uc := usecase.NewFileUsecase(mockFileRepository, mockProxyRepository, testFileOutputExtensions)
+	uc.SaveFiles()
+
+	// (5 categories * number of extensions * 2 file types (classic, advanced)) + (5 all * 1 extension txt * 1 file type classic)
+	want := (5 * len(testFileOutputExtensions) * 2) + (5 * 1 * 1)
+	if got != want {
+		t.Errorf(expectedButGotMessage, "calls", want, got)
+	}
+}
diff --git a/test/unit/internal/usecase/proxy_usecase_test.go b/test/unit/internal/usecase/proxy_usecase_test.go
new file mode 100644
index 00000000..58049d42
--- /dev/null
+++ b/test/unit/internal/usecase/proxy_usecase_test.go
@@ -0,0 +1,387 @@
+package usecase_test
+
+import (
+	"errors"
+	"net"
+	"reflect"
+	"sync"
+	"testing"
+
+	"github.com/fyvri/fresh-proxy-list/internal/entity"
+	"github.com/fyvri/fresh-proxy-list/internal/infrastructure/repository"
+	"github.com/fyvri/fresh-proxy-list/internal/service"
+	"github.com/fyvri/fresh-proxy-list/internal/usecase"
+)
+
+func TestNewProxyUsecase(t *testing.T) {
+	mockProxyRepository := &mockProxyRepository{}
+	mockProxyService := &mockProxyService{}
+	proxyUsecase := usecase.NewProxyUsecase(mockProxyRepository, mockProxyService, testSpecialIPs, testPrivateIPs)
+	if proxyUsecase == nil {
+		t.Errorf(expectedReturnNonNil, "NewProxyUsecase", "ProxyUsecaseInterface")
+	}
+
+	uc, ok := proxyUsecase.(*usecase.ProxyUsecase)
+	if !ok {
+		t.Errorf(expectedTypeAssertionErrorMessage, "*usecase.ProxyUsecase")
+	}
+
+	testKey := testProxyEntity1.Category + "_" + testProxyEntity1.Proxy
+	testValue := true
+	uc.ProxyMap.Store(testKey, testValue)
+
+	got, ok := uc.ProxyMap.Load(testKey)
+	if !ok || got != testValue {
+		t.Errorf(expectedButGotMessage, "value", testValue, got)
+	}
+
+	_, loaded := uc.ProxyMap.LoadOrStore(testKey, false)
+	if !loaded {
+		t.Errorf("Expected LoadOrStore to return true indicating the key was loaded")
+	}
+
+	got, _ = uc.ProxyMap.Load(testKey)
+	if got != testValue {
+		t.Errorf(expectedButGotMessage, "value after LoadOrStore", testValue, got)
+	}
+
+	if !reflect.DeepEqual(uc.SpecialIPs, testSpecialIPs) {
+		t.Errorf(expectedButGotMessage, "SpecialIPs", testSpecialIPs, uc.SpecialIPs)
+	}
+
+	if !reflect.DeepEqual(uc.PrivateIPs, testPrivateIPs) {
+		t.Errorf(expectedButGotMessage, "PrivateIPs", testPrivateIPs, uc.PrivateIPs)
+	}
+}
+
+func TestProcessProxy(t *testing.T) {
+	type fields struct {
+		proxyRepository repository.ProxyRepositoryInterface
+		proxyService    service.ProxyServiceInterface
+	}
+
+	type args struct {
+		category  string
+		proxy     string
+		isChecked bool
+	}
+
+	tests := []struct {
+		name      string
+		fields    fields
+		args      args
+		want      *entity.Proxy
+		wantError error
+	}{
+		{
+			name: "ProxyNotFound",
+			fields: fields{
+				proxyRepository: &mockProxyRepository{},
+				proxyService:    &mockProxyService{},
+			},
+			args: args{
+				category:  testHTTPCategory,
+				proxy:     "   ",
+				isChecked: false,
+			},
+			want:      nil,
+			wantError: errors.New("proxy not found"),
+		},
+		{
+			name: "ProxyFormatIncorrect",
+			fields: fields{
+				proxyRepository: &mockProxyRepository{},
+				proxyService:    &mockProxyService{},
+			},
+			args: args{
+				category:  testHTTPCategory,
+				proxy:     "invalid-proxy",
+				isChecked: false,
+			},
+			want:      nil,
+			wantError: errors.New("proxy format incorrect"),
+		},
+		{
+			name: "ProxyFormatNotMatch",
+			fields: fields{
+				proxyRepository: &mockProxyRepository{},
+				proxyService:    &mockProxyService{},
+			},
+			args: args{
+				category:  testHTTPCategory,
+				proxy:     "invalid-proxy:1337",
+				isChecked: false,
+			},
+			want:      nil,
+			wantError: errors.New("proxy format not match"),
+		},
+		{
+			name: "ProxyIsSpecialIP",
+			fields: fields{
+				proxyRepository: &mockProxyRepository{},
+				proxyService:    &mockProxyService{},
+			},
+			args: args{
+				category:  testHTTPCategory,
+				proxy:     "1.1.1.1:1337",
+				isChecked: false,
+			},
+			want:      nil,
+			wantError: errors.New("proxy belongs to special ip"),
+		},
+		{
+			name: "ProxyPortIsMoreThan65535",
+			fields: fields{
+				proxyRepository: &mockProxyRepository{},
+				proxyService:    &mockProxyService{},
+			},
+			args: args{
+				category:  testHTTPCategory,
+				proxy:     testIP1 + ":65540",
+				isChecked: false,
+			},
+			want:      nil,
+			wantError: errors.New("proxy port format incorrect"),
+		},
+		{
+			name: "ProxyHasBeenProcessed",
+			fields: fields{
+				proxyRepository: &mockProxyRepository{},
+			},
+			args: args{
+				category:  testProxyEntity1.Category,
+				proxy:     testProxyEntity1.Proxy,
+				isChecked: false,
+			},
+			want:      nil,
+			wantError: errors.New("proxy has been processed"),
+		},
+		{
+			name: "ValidProxy",
+			fields: fields{
+				proxyRepository: &mockProxyRepository{},
+				proxyService: &mockProxyService{
+					CheckFunc: func(category string, ip string, port string) (*entity.Proxy, error) {
+						return &testProxyEntity1, nil
+					},
+				},
+			},
+			args: args{
+				category:  testProxyEntity1.Category,
+				proxy:     testProxyEntity1.Proxy,
+				isChecked: true,
+			},
+			want: &entity.Proxy{
+				Category:  testProxyEntity1.Category,
+				Proxy:     testProxyEntity1.Proxy,
+				IP:        testProxyEntity1.IP,
+				Port:      testProxyEntity1.Port,
+				TimeTaken: testProxyEntity1.TimeTaken,
+				CheckedAt: testProxyEntity1.CheckedAt,
+			},
+			wantError: nil,
+		},
+		{
+			name: "NotValidProxy",
+			fields: fields{
+				proxyRepository: &mockProxyRepository{},
+				proxyService: &mockProxyService{
+					CheckFunc: func(category string, ip string, port string) (*entity.Proxy, error) {
+						return nil, errors.New("proxy not valid")
+					},
+				},
+			},
+			args: args{
+				category:  testProxyEntity1.Category,
+				proxy:     testProxyEntity1.Proxy,
+				isChecked: true,
+			},
+			want:      nil,
+			wantError: errors.New("proxy not valid"),
+		},
+		{
+			name: "ValidProxyWithNotChecked",
+			fields: fields{
+				proxyRepository: &mockProxyRepository{},
+				proxyService: &mockProxyService{
+					CheckFunc: func(category string, ip string, port string) (*entity.Proxy, error) {
+						return &testProxyEntity1, nil
+					},
+				},
+			},
+			args: args{
+				category:  testProxyEntity1.Category,
+				proxy:     testProxyEntity1.Proxy,
+				isChecked: false,
+			},
+			want: &entity.Proxy{
+				Category:  testProxyEntity1.Category,
+				Proxy:     testProxyEntity1.Proxy,
+				IP:        testProxyEntity1.IP,
+				Port:      testProxyEntity1.Port,
+				TimeTaken: 0,
+				CheckedAt: "",
+			},
+			wantError: nil,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			uc := &usecase.ProxyUsecase{
+				ProxyRepository: tt.fields.proxyRepository,
+				ProxyService:    tt.fields.proxyService,
+				ProxyMap:        sync.Map{},
+				SpecialIPs:      testSpecialIPs,
+				PrivateIPs:      testPrivateIPs,
+			}
+
+			if tt.name == "ProxyHasBeenProcessed" {
+				uc.ProxyMap.Store(tt.args.category+"_"+tt.args.proxy, true)
+			}
+
+			got, err := uc.ProcessProxy(tt.args.category, tt.args.proxy, tt.args.isChecked)
+
+			if err != nil && err.Error() != tt.wantError.Error() {
+				t.Errorf(expectedErrorButGotMessage, "ProcessProxy()", tt.wantError, err)
+			}
+
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf(expectedButGotMessage, "ProcessProxy()", tt.want, got)
+			}
+		})
+	}
+}
+
+func TestIsSpecialIP(t *testing.T) {
+	type args struct {
+		ip string
+	}
+
+	type fields struct {
+		specialIPs []string
+		privateIPs []net.IPNet
+	}
+
+	tests := []struct {
+		name   string
+		fields fields
+		args   args
+		want   bool
+	}{
+		{
+			name: "ItIsSpecialIP",
+			fields: fields{
+				specialIPs: testSpecialIPs,
+				privateIPs: testPrivateIPs,
+			},
+			args: args{
+				ip: "1.1.1.1",
+			},
+			want: true,
+		},
+		{
+			name: "ErrorParseIP",
+			fields: fields{
+				specialIPs: testSpecialIPs,
+				privateIPs: testPrivateIPs,
+			},
+			args: args{
+				ip: "13.37.1",
+			},
+			want: true,
+		},
+		{
+			name: "ItIsUnspecified",
+			fields: fields{
+				specialIPs: testSpecialIPs,
+				privateIPs: testPrivateIPs,
+			},
+			args: args{
+				ip: "::1",
+			},
+			want: true,
+		},
+		{
+			name: "ItIsPrivateIP",
+			fields: fields{
+				specialIPs: testSpecialIPs,
+				privateIPs: testPrivateIPs,
+			},
+			args: args{
+				ip: "5.5.5.5",
+			},
+			want: true,
+		},
+		{
+			name: "ItIsNotSpecialIP",
+			fields: fields{
+				specialIPs: testSpecialIPs,
+				privateIPs: testPrivateIPs,
+			},
+			args: args{
+				ip: "13.37.0.1",
+			},
+			want: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			uc := &usecase.ProxyUsecase{
+				SpecialIPs: testSpecialIPs,
+				PrivateIPs: testPrivateIPs,
+			}
+			got := uc.IsSpecialIP(tt.args.ip)
+			if got != tt.want {
+				t.Errorf(expectedButGotMessage, "IP: "+tt.args.ip, tt.want, got)
+			}
+		})
+	}
+}
+
+func TestGetAllAdvancedView(t *testing.T) {
+	type fields struct {
+		proxyRepository repository.ProxyRepositoryInterface
+	}
+
+	tests := []struct {
+		name   string
+		fields fields
+		want   []entity.AdvancedProxy
+	}{
+		{
+			name: "Should return all advanced view proxies",
+			fields: fields{
+				proxyRepository: &mockProxyRepository{
+					GetAllAdvancedViewFunc: func() []entity.AdvancedProxy {
+						return []entity.AdvancedProxy{
+							testAdvancedProxyEntity1,
+						}
+					},
+				},
+			},
+			want: []entity.AdvancedProxy{
+				testAdvancedProxyEntity1,
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			uc := &usecase.ProxyUsecase{
+				ProxyRepository: tt.fields.proxyRepository,
+			}
+			got := uc.GetAllAdvancedView()
+			if len(got) != len(tt.want) {
+				t.Errorf(expectedButGotMessage, "GetAllAdvancedView()", tt.want, got)
+			}
+
+			for i, v := range got {
+				if !reflect.DeepEqual(v, tt.want[i]) {
+					t.Errorf(expectedButGotMessage, "GetAllAdvancedView()", tt.want[i], v)
+				}
+			}
+		})
+	}
+}
diff --git a/test/unit/internal/usecase/source_usecase_test.go b/test/unit/internal/usecase/source_usecase_test.go
new file mode 100644
index 00000000..695548f0
--- /dev/null
+++ b/test/unit/internal/usecase/source_usecase_test.go
@@ -0,0 +1,250 @@
+package usecase_test
+
+import (
+	"errors"
+	"reflect"
+	"testing"
+
+	"github.com/fyvri/fresh-proxy-list/internal/entity"
+	"github.com/fyvri/fresh-proxy-list/internal/infrastructure/repository"
+	"github.com/fyvri/fresh-proxy-list/internal/usecase"
+	"github.com/fyvri/fresh-proxy-list/pkg/utils"
+)
+
+var (
+	testListMethod  = "LIST"
+	testScrapMethod = "SCRAP"
+	testCategory    = "HTTP"
+	testURL         = "http://example.com"
+	testIsChecked   = true
+)
+
+func TestNewSourceUsecase(t *testing.T) {
+	type fields struct {
+		sourceRepository repository.SourceRepositoryInterface
+		fetcherUtil      utils.FetcherUtilInterface
+	}
+
+	tests := []struct {
+		name   string
+		fields fields
+		want   *usecase.SourceUsecase
+	}{
+		{
+			name: "Success",
+			fields: fields{
+				sourceRepository: &mockSourceRepository{},
+				fetcherUtil:      &mockFetcherUtil{},
+			},
+			want: &usecase.SourceUsecase{
+				SourceRepository: &mockSourceRepository{},
+				FetcherUtil:      &mockFetcherUtil{},
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			sourceUsecase := usecase.NewSourceUsecase(tt.fields.sourceRepository, tt.fields.fetcherUtil)
+			if sourceUsecase == nil {
+				t.Errorf(expectedReturnNonNil, "NewSourceUsecase", "SourceUsecaseInterface")
+			}
+
+			got, ok := sourceUsecase.(*usecase.SourceUsecase)
+			if !ok {
+				t.Errorf(expectedTypeAssertionErrorMessage, "*usecase.SourceUsecase")
+			}
+
+			if !reflect.DeepEqual(tt.want, got) {
+				t.Errorf(expectedButGotMessage, "*usecase.SourceUsecase", tt.want, got)
+			}
+		})
+	}
+}
+
+func TestLoadSourcesSuccess(t *testing.T) {
+	type fields struct {
+		sourceRepository repository.SourceRepositoryInterface
+	}
+
+	tests := []struct {
+		name      string
+		fields    fields
+		want      []entity.Source
+		wantError error
+	}{
+		{
+			name: "Success",
+			fields: fields{
+				sourceRepository: &mockSourceRepository{
+					LoadSourcesFunc: func() ([]entity.Source, error) {
+						return []entity.Source{
+							{
+								Method:    testListMethod,
+								Category:  testCategory,
+								URL:       testURL,
+								IsChecked: testIsChecked,
+							},
+						}, nil
+					},
+				},
+			},
+			want: []entity.Source{
+				{
+					Method:    testListMethod,
+					Category:  testCategory,
+					URL:       testURL,
+					IsChecked: testIsChecked,
+				},
+			},
+			wantError: nil,
+		},
+		{
+			name: "Error",
+			fields: fields{
+				sourceRepository: &mockSourceRepository{
+					LoadSourcesFunc: func() ([]entity.Source, error) {
+						return nil, errors.New("load proxy resource error")
+					},
+				},
+			},
+			want:      nil,
+			wantError: errors.New("load proxy resource error"),
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			uc := &usecase.SourceUsecase{
+				SourceRepository: tt.fields.sourceRepository,
+			}
+			got, err := uc.LoadSources()
+
+			if err != nil && err.Error() != tt.wantError.Error() {
+				t.Errorf(expectedErrorButGotMessage, "ProcessProxy()", tt.wantError, err)
+			}
+
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf(expectedButGotMessage, "ProcessProxy()", tt.want, got)
+			}
+		})
+	}
+}
+
+func TestProcessSource(t *testing.T) {
+	type fields struct {
+		fetcherUtil utils.FetcherUtilInterface
+	}
+
+	type args struct {
+		source entity.Source
+	}
+
+	tests := []struct {
+		name      string
+		fields    fields
+		args      args
+		want      []string
+		wantError error
+	}{
+		{
+			name: "TestFetcherError",
+			fields: fields{
+				fetcherUtil: &mockFetcherUtil{
+					fetcherError: errors.New("error creating request"),
+				},
+			},
+			args: args{
+				source: entity.Source{
+					Method:    testListMethod,
+					Category:  testCategory,
+					URL:       testURL,
+					IsChecked: testIsChecked,
+				},
+			},
+			want:      nil,
+			wantError: errors.New("error creating request"),
+		},
+		{
+			name: "TestFetcherWithListMethod",
+			fields: fields{
+				fetcherUtil: &mockFetcherUtil{
+					fetchDataByte: []byte(testProxy1 + "\n" + testProxy2 + "\n" + testProxy3 + "\n" + testProxy4),
+				},
+			},
+			args: args{
+				source: entity.Source{
+					Method:    testListMethod,
+					Category:  testCategory,
+					URL:       testURL,
+					IsChecked: testIsChecked,
+				},
+			},
+			want: []string{
+				testProxy1,
+				testProxy2,
+				testProxy3,
+				testProxy4,
+			},
+			wantError: nil,
+		},
+		{
+			name: "TestFetcherWithScrapMethod",
+			fields: fields{
+				fetcherUtil: &mockFetcherUtil{
+					fetchDataByte: []byte(testProxy1 + "\n" + testProxy2 + "\n" + testProxy3 + "\n" + testProxy4),
+				},
+			},
+			args: args{
+				source: entity.Source{
+					Method:    testScrapMethod,
+					Category:  testCategory,
+					URL:       testURL,
+					IsChecked: testIsChecked,
+				},
+			},
+			want: []string{
+				testProxy1,
+				testProxy2,
+				testProxy3,
+				testProxy4,
+			},
+			wantError: nil,
+		},
+		{
+			name: "TestFetcherWithUndefinedMethod",
+			fields: fields{
+				fetcherUtil: &mockFetcherUtil{},
+			},
+			args: args{
+				source: entity.Source{
+					Method:    "NO_METHOD",
+					Category:  testCategory,
+					URL:       testURL,
+					IsChecked: testIsChecked,
+				},
+			},
+			want:      nil,
+			wantError: errors.New("source method not found: NO_METHOD"),
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			uc := &usecase.SourceUsecase{
+				FetcherUtil: tt.fields.fetcherUtil,
+			}
+			got, err := uc.ProcessSource(&tt.args.source)
+
+			if (err != nil && tt.wantError != nil && err.Error() != tt.wantError.Error()) ||
+				(err == nil && tt.wantError != nil) ||
+				(err != nil && tt.wantError == nil) {
+				t.Errorf(expectedErrorButGotMessage, "SourceUsecase.ProcessSource()", tt.wantError, err)
+			}
+
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf(expectedButGotMessage, "SourceUsecase.ProcessSource()", tt.want, got)
+			}
+		})
+	}
+}
diff --git a/test/unit/internal/usecase/usecase_test.go b/test/unit/internal/usecase/usecase_test.go
new file mode 100644
index 00000000..3d746d20
--- /dev/null
+++ b/test/unit/internal/usecase/usecase_test.go
@@ -0,0 +1,367 @@
+package usecase_test
+
+import (
+	"io"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"sync"
+	"time"
+
+	"github.com/fyvri/fresh-proxy-list/internal/entity"
+)
+
+var (
+	unexpectedMessage                 = "Unexpected %v: %v"
+	expectedButGotMessage             = "Expected %v = %v, but got = %v"
+	expectedErrorButGotMessage        = "Expected %v error = %v, but got = %v"
+	expectedReturnNonNil              = "Expected %v to return a non-nil %v"
+	expectedTypeAssertionErrorMessage = "Expected type assertion error, but got = %v"
+	testStorageDir                    = "storage"
+	testClassicDir                    = "classic"
+	testAdvancedDir                   = "advanced"
+	testTXTExtension                  = "txt"
+	testCSVExtension                  = "csv"
+	testJSONExtension                 = "json"
+	testXMLExtension                  = "xml"
+	testYAMLExtension                 = "yaml"
+	testFileOutputExtensions          = []string{testTXTExtension, testCSVExtension}
+	testHTTPCategory                  = "HTTP"
+	testHTTPSCategory                 = "HTTPS"
+	testSOCKS4Category                = "SOCKS4"
+	testSOCKS5Category                = "SOCKS5"
+	testSpecialIPs                    = []string{"1.1.1.1", "2.2.2.2"}
+	testPrivateIPs                    = []net.IPNet{
+		{
+			IP:   net.IP{3, 3, 3, 3},
+			Mask: net.CIDRMask(8, 32),
+		},
+		{
+			IP:   net.IP{4, 4, 4, 4},
+			Mask: net.CIDRMask(12, 32),
+		},
+		{
+			IP:   net.IP{5, 5, 5, 5},
+			Mask: net.CIDRMask(16, 32),
+		},
+	}
+
+	testIP1          = "13.37.0.1"
+	testPort1        = "1337"
+	testProxy1       = testIP1 + ":" + testPort1
+	testCategory1    = testHTTPCategory
+	testProxyEntity1 = entity.Proxy{
+		Proxy:     testProxy1,
+		IP:        testIP1,
+		Port:      testPort1,
+		Category:  testCategory1,
+		TimeTaken: 0,
+		CheckedAt: time.Now().Format(time.RFC3339),
+	}
+	testAdvancedProxyEntity1 = entity.AdvancedProxy{
+		Proxy:     testProxyEntity1.Proxy,
+		IP:        testProxyEntity1.IP,
+		Port:      testProxyEntity1.Port,
+		TimeTaken: testProxyEntity1.TimeTaken,
+		CheckedAt: testProxyEntity1.CheckedAt,
+		Categories: []string{
+			testCategory1,
+		},
+	}
+
+	testIP2          = "13.37.0.2"
+	testPort2        = "1337"
+	testProxy2       = testIP2 + ":" + testPort2
+	testCategory2    = testHTTPSCategory
+	testProxyEntity2 = entity.Proxy{
+		Proxy:     testProxy2,
+		IP:        testIP2,
+		Port:      testPort2,
+		Category:  testCategory2,
+		TimeTaken: 0,
+		CheckedAt: time.Now().Format(time.RFC3339),
+	}
+	testAdvancedProxyEntity2 = entity.AdvancedProxy{
+		Proxy:     testProxyEntity2.Proxy,
+		IP:        testProxyEntity2.IP,
+		Port:      testProxyEntity2.Port,
+		TimeTaken: testProxyEntity2.TimeTaken,
+		CheckedAt: testProxyEntity2.CheckedAt,
+		Categories: []string{
+			testCategory2,
+		},
+	}
+
+	testIP3          = "13.37.0.3"
+	testPort3        = "1337"
+	testProxy3       = testIP3 + ":" + testPort3
+	testCategory3    = testSOCKS4Category
+	testProxyEntity3 = entity.Proxy{
+		Proxy:     testProxy3,
+		IP:        testIP3,
+		Port:      testPort3,
+		Category:  testCategory3,
+		TimeTaken: 0,
+		CheckedAt: time.Now().Format(time.RFC3339),
+	}
+	testAdvancedProxyEntity3 = entity.AdvancedProxy{
+		Proxy:     testProxyEntity3.Proxy,
+		IP:        testProxyEntity3.IP,
+		Port:      testProxyEntity3.Port,
+		TimeTaken: testProxyEntity3.TimeTaken,
+		CheckedAt: testProxyEntity3.CheckedAt,
+		Categories: []string{
+			testCategory3,
+		},
+	}
+
+	testIP4          = "13.37.0.4"
+	testPort4        = "1337"
+	testProxy4       = testIP4 + ":" + testPort4
+	testCategory4    = testSOCKS5Category
+	testProxyEntity4 = entity.Proxy{
+		Proxy:     testProxy4,
+		IP:        testIP4,
+		Port:      testPort4,
+		Category:  testCategory4,
+		TimeTaken: 0,
+		CheckedAt: time.Now().Format(time.RFC3339),
+	}
+	testAdvancedProxyEntity4 = entity.AdvancedProxy{
+		Proxy:     testProxyEntity4.Proxy,
+		IP:        testProxyEntity4.IP,
+		Port:      testProxyEntity4.Port,
+		TimeTaken: testProxyEntity4.TimeTaken,
+		CheckedAt: testProxyEntity4.CheckedAt,
+		Categories: []string{
+			testCategory4,
+		},
+	}
+)
+
+type mockFetcherUtil struct {
+	fetchDataByte  []byte
+	fetcherError   error
+	NewRequestFunc func(method, url string, body io.Reader) (*http.Request, error)
+	DoFunc         func(client *http.Client, req *http.Request) (*http.Response, error)
+}
+
+func (m *mockFetcherUtil) FetchData(url string) ([]byte, error) {
+	if m.fetcherError != nil {
+		return nil, m.fetcherError
+	}
+	return m.fetchDataByte, nil
+}
+
+func (m *mockFetcherUtil) Do(client *http.Client, req *http.Request) (*http.Response, error) {
+	if m.DoFunc != nil {
+		return m.DoFunc(client, req)
+	}
+	return httptest.NewRecorder().Result(), nil
+}
+
+func (m *mockFetcherUtil) NewRequest(method string, url string, body io.Reader) (*http.Request, error) {
+	if m.NewRequestFunc != nil {
+		return m.NewRequestFunc(method, url, body)
+	}
+	return http.NewRequest(method, url, body)
+}
+
+type mockProxyService struct {
+	CheckFunc              func(category string, ip string, port string) (*entity.Proxy, error)
+	GetTestingSiteFunc     func(category string) string
+	GetRandomUserAgentFunc func() string
+}
+
+func (m *mockProxyService) Check(category string, ip string, port string) (*entity.Proxy, error) {
+	if m.CheckFunc != nil {
+		return m.CheckFunc(category, ip, port)
+	}
+	return nil, nil
+}
+
+func (m *mockProxyService) GetTestingSite(category string) string {
+	if m.GetTestingSiteFunc != nil {
+		return m.GetTestingSiteFunc(category)
+	}
+	return ""
+}
+
+func (m *mockProxyService) GetRandomUserAgent() string {
+	if m.GetRandomUserAgentFunc != nil {
+		return m.GetRandomUserAgentFunc()
+	}
+	return ""
+}
+
+type mockSourceRepository struct {
+	LoadSourcesFunc func() ([]entity.Source, error)
+}
+
+func (m *mockSourceRepository) LoadSources() ([]entity.Source, error) {
+	return m.LoadSourcesFunc()
+}
+
+type mockFileRepository struct {
+	SaveFileFunc        func(filename string, data interface{}, format string) error
+	CreateDirectoryFunc func(filePath string) error
+	WriteTxtFunc        func(writer io.Writer, data interface{}) error
+	EncodeCSVFunc       func(writer io.Writer, data interface{}) error
+	WriteCSVFunc        func(writer io.Writer, header []string, rows [][]string) error
+	EncodeJSONFunc      func(writer io.Writer, data interface{}) error
+	EncodeXMLFunc       func(writer io.Writer, data interface{}) error
+	EncodeYAMLFunc      func(writer io.Writer, data interface{}) error
+}
+
+func (m *mockFileRepository) SaveFile(filename string, data interface{}, ext string) error {
+	if m.SaveFileFunc != nil {
+		return m.SaveFileFunc(filename, data, ext)
+	}
+	return nil
+}
+
+func (m *mockFileRepository) CreateDirectory(filePath string) error {
+	if m.CreateDirectoryFunc != nil {
+		return m.CreateDirectoryFunc(filePath)
+	}
+	return nil
+}
+
+func (m *mockFileRepository) WriteTxt(writer io.Writer, data interface{}) error {
+	if m.WriteTxtFunc != nil {
+		return m.WriteTxtFunc(writer, data)
+	}
+	return nil
+}
+
+func (m *mockFileRepository) EncodeCSV(writer io.Writer, data interface{}) error {
+	if m.EncodeCSVFunc != nil {
+		return m.EncodeCSVFunc(writer, data)
+	}
+	return nil
+}
+
+func (m *mockFileRepository) WriteCSV(writer io.Writer, header []string, rows [][]string) error {
+	if m.WriteCSVFunc != nil {
+		return m.WriteCSVFunc(writer, header, rows)
+	}
+	return nil
+}
+
+func (m *mockFileRepository) EncodeJSON(writer io.Writer, data interface{}) error {
+	if m.EncodeJSONFunc != nil {
+		return m.EncodeJSONFunc(writer, data)
+	}
+	return nil
+}
+
+func (m *mockFileRepository) EncodeXML(writer io.Writer, data interface{}) error {
+	if m.EncodeXMLFunc != nil {
+		return m.EncodeXMLFunc(writer, data)
+	}
+	return nil
+}
+
+func (m *mockFileRepository) EncodeYAML(writer io.Writer, data interface{}) error {
+	if m.EncodeYAMLFunc != nil {
+		return m.EncodeYAMLFunc(writer, data)
+	}
+	return nil
+}
+
+type mockProxyRepository struct {
+	StoreFunc                 func(proxy *entity.Proxy)
+	GetAllClassicViewFunc     func() []string
+	GetHTTPClassicViewFunc    func() []string
+	GetHTTPSClassicViewFunc   func() []string
+	GetSOCKS4ClassicViewFunc  func() []string
+	GetSOCKS5ClassicViewFunc  func() []string
+	GetAllAdvancedViewFunc    func() []entity.AdvancedProxy
+	GetHTTPAdvancedViewFunc   func() []entity.Proxy
+	GetHTTPSAdvancedViewFunc  func() []entity.Proxy
+	GetSOCKS4AdvancedViewFunc func() []entity.Proxy
+	GetSOCKS5AdvancedViewFunc func() []entity.Proxy
+
+	StoredProxies []entity.Proxy
+	Mutex         sync.Mutex
+}
+
+func (m *mockProxyRepository) Store(proxy *entity.Proxy) {
+	m.Mutex.Lock()
+	defer m.Mutex.Unlock()
+	m.StoredProxies = append(m.StoredProxies, *proxy)
+}
+
+func (m *mockProxyRepository) GetStoredProxies() []entity.Proxy {
+	return m.StoredProxies
+}
+
+func (m *mockProxyRepository) GetAllClassicView() []string {
+	if m.GetAllClassicViewFunc != nil {
+		return m.GetAllClassicViewFunc()
+	}
+	return nil
+}
+
+func (m *mockProxyRepository) GetHTTPClassicView() []string {
+	if m.GetHTTPClassicViewFunc != nil {
+		return m.GetHTTPClassicViewFunc()
+	}
+	return nil
+}
+
+func (m *mockProxyRepository) GetHTTPSClassicView() []string {
+	if m.GetHTTPSClassicViewFunc != nil {
+		return m.GetHTTPSClassicViewFunc()
+	}
+	return nil
+}
+
+func (m *mockProxyRepository) GetSOCKS4ClassicView() []string {
+	if m.GetSOCKS4ClassicViewFunc != nil {
+		return m.GetSOCKS4ClassicViewFunc()
+	}
+	return nil
+}
+
+func (m *mockProxyRepository) GetSOCKS5ClassicView() []string {
+	if m.GetSOCKS5ClassicViewFunc != nil {
+		return m.GetSOCKS5ClassicViewFunc()
+	}
+	return nil
+}
+
+func (m *mockProxyRepository) GetAllAdvancedView() []entity.AdvancedProxy {
+	if m.GetAllAdvancedViewFunc != nil {
+		return m.GetAllAdvancedViewFunc()
+	}
+	return nil
+}
+
+func (m *mockProxyRepository) GetHTTPAdvancedView() []entity.Proxy {
+	if m.GetHTTPAdvancedViewFunc != nil {
+		return m.GetHTTPAdvancedViewFunc()
+	}
+	return nil
+}
+
+func (m *mockProxyRepository) GetHTTPSAdvancedView() []entity.Proxy {
+	if m.GetHTTPSAdvancedViewFunc != nil {
+		return m.GetHTTPSAdvancedViewFunc()
+	}
+	return nil
+}
+
+func (m *mockProxyRepository) GetSOCKS4AdvancedView() []entity.Proxy {
+	if m.GetSOCKS4AdvancedViewFunc != nil {
+		return m.GetSOCKS4AdvancedViewFunc()
+	}
+	return nil
+}
+
+func (m *mockProxyRepository) GetSOCKS5AdvancedView() []entity.Proxy {
+	if m.GetSOCKS5AdvancedViewFunc != nil {
+		return m.GetSOCKS5AdvancedViewFunc()
+	}
+	return nil
+}
diff --git a/test/unit/pkg/utils/csv_writer_util_test.go b/test/unit/pkg/utils/csv_writer_util_test.go
new file mode 100644
index 00000000..d2f05d6c
--- /dev/null
+++ b/test/unit/pkg/utils/csv_writer_util_test.go
@@ -0,0 +1,155 @@
+package util_test
+
+import (
+	"bytes"
+	"encoding/csv"
+	"io"
+	"reflect"
+	"testing"
+
+	"github.com/fyvri/fresh-proxy-list/pkg/utils"
+)
+
+var (
+	writerBufferSize = 1024
+)
+
+func TestNewCSVWriter(t *testing.T) {
+	tests := []struct {
+		name string
+		want utils.CSVWriterUtilInterface
+	}{
+		{
+			name: "Success",
+			want: &utils.CSVWriterUtil{},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			csvWriterUtil := utils.NewCSVWriter()
+			if csvWriterUtil == nil {
+				t.Errorf(expectedReturnNonNil, "NewCSVWriter", "CSVWriterUtilInterface")
+			}
+
+			got, ok := csvWriterUtil.(*utils.CSVWriterUtil)
+			if !ok {
+				t.Errorf(expectedTypeAssertionErrorMessage, "*utils.CSVWriterUtil")
+			}
+
+			if !reflect.DeepEqual(tt.want, got) {
+				t.Errorf(expectedButGotMessage, "*utils.CSVWriterUtil", tt.want, got)
+			}
+		})
+	}
+}
+
+func TestInit(t *testing.T) {
+	type args struct {
+		writer io.Writer
+	}
+
+	tests := []struct {
+		name string
+		args args
+		want *csv.Writer
+	}{
+		{
+			name: "Success",
+			args: args{
+				writer: bytes.NewBuffer(make([]byte, writerBufferSize)),
+			},
+			want: csv.NewWriter(bytes.NewBuffer(make([]byte, writerBufferSize))),
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			u := utils.NewCSVWriter()
+			got := u.Init(tt.args.writer)
+			if reflect.TypeOf(got) != reflect.TypeOf(tt.want) {
+				t.Errorf(expectedButGotMessage, "Init()", reflect.TypeOf(tt.want), reflect.TypeOf(got))
+			}
+		})
+	}
+}
+
+func TestFlush(t *testing.T) {
+	type setup struct {
+		newCSVWriter func() *utils.CSVWriterUtil
+	}
+
+	type args struct {
+		csvWriter *csv.Writer
+	}
+
+	tests := []struct {
+		name  string
+		setup setup
+		args  args
+	}{
+		{
+			name: "Success",
+			setup: setup{
+				newCSVWriter: func() *utils.CSVWriterUtil {
+					return utils.NewCSVWriter().(*utils.CSVWriterUtil)
+				},
+			},
+			args: args{
+				csvWriter: csv.NewWriter(bytes.NewBuffer(make([]byte, writerBufferSize))),
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			u := tt.setup.newCSVWriter()
+			u.Flush(tt.args.csvWriter)
+		})
+	}
+}
+
+func TestWrite(t *testing.T) {
+	type setup struct {
+		newCSVWriter func() *utils.CSVWriterUtil
+	}
+
+	type args struct {
+		writer io.Writer
+		record []string
+	}
+
+	tests := []struct {
+		name      string
+		setup     setup
+		args      args
+		wantError error
+	}{
+		{
+			name: "Success",
+			setup: setup{
+				newCSVWriter: func() *utils.CSVWriterUtil {
+					return utils.NewCSVWriter().(*utils.CSVWriterUtil)
+				},
+			},
+			args: args{
+				writer: &bytes.Buffer{},
+				record: []string{"a", "b", "c"},
+			},
+			wantError: nil,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			u := tt.setup.newCSVWriter()
+			csvWriter := u.Init(tt.args.writer)
+			err := u.Write(csvWriter, tt.args.record)
+			if (err != nil && tt.wantError != nil && err.Error() != tt.wantError.Error()) ||
+				(err == nil && tt.wantError != nil) ||
+				(err != nil && tt.wantError == nil) {
+				t.Errorf(expectedErrorButGotMessage, "Write()", tt.wantError, err)
+			}
+		})
+	}
+}
diff --git a/test/unit/pkg/utils/fetcher_util_test.go b/test/unit/pkg/utils/fetcher_util_test.go
new file mode 100644
index 00000000..e252a2b9
--- /dev/null
+++ b/test/unit/pkg/utils/fetcher_util_test.go
@@ -0,0 +1,251 @@
+package util_test
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"reflect"
+	"testing"
+
+	"github.com/fyvri/fresh-proxy-list/pkg/utils"
+)
+
+var (
+	testGETMethod  = "GET"
+	testPOSTMethod = "POST"
+	testClient     = http.DefaultClient
+	testNewRequest = http.NewRequest
+)
+
+func TestNewFetcher(t *testing.T) {
+	fetcherUtil := utils.NewFetcher(testClient, testNewRequest)
+
+	if fetcherUtil == nil {
+		t.Errorf(expectedReturnNonNil, "NewFetcher", "FetcherInterface")
+	}
+
+	fetcherUtilInstance, ok := fetcherUtil.(*utils.FetcherUtil)
+	if !ok {
+		t.Errorf(expectedTypeAssertionErrorMessage, "*utils.FetcherUtil")
+	}
+
+	req, err := fetcherUtilInstance.NewRequestFunc(testGETMethod, testRawURL, nil)
+	if err != nil {
+		t.Errorf(expectedButGotMessage, "newRequest", "no error", err)
+	}
+
+	if req.Method != testGETMethod {
+		t.Errorf(expectedButGotMessage, "method", testGETMethod, req.Method)
+	}
+
+	if req.URL.String() != testRawURL {
+		t.Errorf(expectedButGotMessage, "URL", testRawURL, req.URL.String())
+	}
+
+	if fetcherUtilInstance.Client != nil && fetcherUtilInstance.Client != http.DefaultClient {
+		t.Errorf(expectedButGotMessage, "client", http.DefaultClient, fetcherUtilInstance.Client)
+	}
+}
+
+func TestFetchData(t *testing.T) {
+	type fields struct {
+		transport      *mockTransport
+		newRequestFunc func(method string, url string, body io.Reader) (*http.Request, error)
+	}
+
+	type args struct {
+		url string
+	}
+
+	tests := []struct {
+		name    string
+		fields  fields
+		args    args
+		want    []byte
+		wantErr error
+	}{
+		{
+			name: "Success",
+			fields: fields{
+				transport: &mockTransport{
+					response: &http.Response{
+						StatusCode: http.StatusOK,
+						Body: io.NopCloser(&mockReadCloser{
+							data: []byte("response data"),
+						}),
+					},
+					err: nil,
+				},
+				newRequestFunc: testNewRequest,
+			},
+			args: args{
+				url: testRawURL,
+			},
+			want:    []byte("response data"),
+			wantErr: nil,
+		},
+		{
+			name: "NewRequestError",
+			fields: fields{
+				transport: &mockTransport{
+					response: nil,
+					err:      nil,
+				},
+				newRequestFunc: func(method string, url string, body io.Reader) (*http.Request, error) {
+					return nil, fmt.Errorf("new request error")
+				},
+			},
+			args: args{
+				url: testRawURL,
+			},
+			want:    nil,
+			wantErr: errors.New("new request error"),
+		},
+		{
+			name: "RequestError",
+			fields: fields{
+				transport: &mockTransport{
+					response: nil,
+					err:      fmt.Errorf("request error"),
+				},
+				newRequestFunc: testNewRequest,
+			},
+			args: args{
+				url: testRawURL,
+			},
+			want:    nil,
+			wantErr: fmt.Errorf("Get \"%s\": request error", testRawURL),
+		},
+		{
+			name: "ResponseError",
+			fields: fields{
+				transport: &mockTransport{
+					response: &http.Response{
+						StatusCode: http.StatusInternalServerError,
+						Body: io.NopCloser(&mockReadCloser{
+							data: []byte("error response"),
+						}),
+					},
+					err: nil,
+				},
+				newRequestFunc: testNewRequest,
+			},
+			args: args{
+				url: testRawURL,
+			},
+			want:    []byte("error response"),
+			wantErr: errors.New("failed to fetch data: Internal Server Error"),
+		},
+		{
+			name: "ReadBodyError",
+			fields: fields{
+				transport: &mockTransport{
+					response: &http.Response{
+						StatusCode: http.StatusOK,
+						Body: &mockReadCloser{
+							errRead: fmt.Errorf("body read error"),
+						},
+					},
+					err: nil,
+				},
+				newRequestFunc: testNewRequest,
+			},
+			args: args{
+				url: testRawURL,
+			},
+			want:    nil,
+			wantErr: errors.New("body read error"),
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			fetcherUtil := &utils.FetcherUtil{
+				Client: &http.Client{
+					Transport: tt.fields.transport,
+				},
+				NewRequestFunc: tt.fields.newRequestFunc,
+			}
+			got, err := fetcherUtil.FetchData(tt.args.url)
+
+			if (err != nil && tt.wantErr != nil && err.Error() != tt.wantErr.Error()) ||
+				(err == nil && tt.wantErr != nil) ||
+				(err != nil && tt.wantErr == nil) {
+				t.Errorf(expectedErrorButGotMessage, "FetchData()", tt.wantErr, err)
+			}
+
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf(expectedButGotMessage, "FetchData()", tt.want, got)
+			}
+		})
+	}
+}
+
+func TestNewRequest(t *testing.T) {
+	type args struct {
+		method string
+		url    string
+		body   io.Reader
+	}
+
+	type want struct {
+		url    string
+		method string
+	}
+
+	tests := []struct {
+		name    string
+		args    args
+		want    want
+		wantErr error
+	}{
+		{
+			name: testGETMethod,
+			args: args{
+				method: http.MethodGet,
+				url:    testRawURL,
+				body:   nil,
+			},
+			want: want{
+				url:    testRawURL,
+				method: http.MethodGet,
+			},
+			wantErr: nil,
+		},
+		{
+			name: testPOSTMethod,
+			args: args{
+				method: http.MethodPost,
+				url:    testRawURL,
+				body:   bytes.NewReader([]byte("body")),
+			},
+			want: want{
+				url:    testRawURL,
+				method: http.MethodPost,
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			u := utils.NewFetcher(&http.Client{
+				Transport: &mockTransport{},
+			}, testNewRequest)
+			req, err := u.NewRequest(tt.args.method, tt.args.url, tt.args.body)
+
+			if err != nil {
+				t.Errorf(expectedErrorButGotMessage, "NewRequest()", nil, err)
+			}
+
+			if req.Method != tt.want.method {
+				t.Errorf(expectedButGotMessage, "method", tt.want.method, req.Method)
+			}
+
+			if req.URL.String() != tt.want.url {
+				t.Errorf(expectedButGotMessage, "URL", tt.want.url, req.URL.String())
+			}
+		})
+	}
+}
diff --git a/test/unit/pkg/utils/url_parser_util_test.go b/test/unit/pkg/utils/url_parser_util_test.go
new file mode 100644
index 00000000..1be7ade8
--- /dev/null
+++ b/test/unit/pkg/utils/url_parser_util_test.go
@@ -0,0 +1,61 @@
+package util_test
+
+import (
+	"net/url"
+	"reflect"
+	"testing"
+
+	"github.com/fyvri/fresh-proxy-list/pkg/utils"
+)
+
+func TestParse(t *testing.T) {
+	type args struct {
+		rawURL string
+	}
+	tests := []struct {
+		name      string
+		args      args
+		want      *url.URL
+		wantError error
+	}{
+		{
+			name: "ValidURL",
+			args: args{
+				rawURL: testRawURL,
+			},
+			want: &url.URL{
+				Scheme: testScheme,
+				Host:   testHost,
+			},
+			wantError: nil,
+		},
+		{
+			name: "ValidURLWithFullURL",
+			args: args{
+				rawURL: testFullURL,
+			},
+			want: &url.URL{
+				Scheme:   testScheme,
+				Host:     testHost,
+				Path:     testPath,
+				RawQuery: testRawQuery,
+			},
+			wantError: nil,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			u := utils.NewURLParser()
+			got, err := u.Parse(tt.args.rawURL)
+
+			if tt.wantError != nil {
+				t.Errorf(expectedErrorButGotMessage, "Parse()", err, tt.wantError)
+			}
+
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf(expectedErrorButGotMessage, "Parse()", err, tt.wantError)
+			}
+		})
+	}
+}
diff --git a/test/unit/pkg/utils/util_test.go b/test/unit/pkg/utils/util_test.go
new file mode 100644
index 00000000..d0407982
--- /dev/null
+++ b/test/unit/pkg/utils/util_test.go
@@ -0,0 +1,49 @@
+package util_test
+
+import (
+	"io"
+	"net/http"
+)
+
+var (
+	expectedButGotMessage             = "Expected %v = %v, but got = %v"
+	expectedErrorButGotMessage        = "Expected %v error = %v, but got = %v"
+	expectedReturnNonNil              = "Expected %v to return a non-nil %v"
+	expectedTypeAssertionErrorMessage = "Expected type assertion error, but got = %v"
+	testScheme                        = "https"
+	testHost                          = "example.com"
+	testPath                          = "/path"
+	testRawQuery                      = "query=1"
+	testRawURL                        = testScheme + "://" + testHost
+	testFullURL                       = testRawURL + testPath + "?" + testRawQuery
+)
+
+type mockTransport struct {
+	response *http.Response
+	err      error
+}
+
+func (m *mockTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	return m.response, m.err
+}
+
+type mockReadCloser struct {
+	data     []byte
+	errRead  error
+	errClose error
+}
+
+func (m *mockReadCloser) Read(p []byte) (int, error) {
+	if m.errRead != nil {
+		return 0, m.errRead
+	}
+	copy(p, m.data)
+	return len(m.data), io.EOF
+}
+
+func (m *mockReadCloser) Close() error {
+	if m.errClose != nil {
+		return m.errClose
+	}
+	return nil
+}